Connect with us


The story behind the mysterious “Monstar Full Titanium” driver shaft spotted on the PGA Tour



Update 6/28 2 p.m.: GolfWRX spoke with Tony Krampel, the North American distributor for Monstar shafts, which are manufactured in South Korea. According to Krampel, there are around 40 players on the LPGA of Korea Tour using the shafts currently, and Natthakritta Vongtaveelap nearly won using it recently. He also said Tom Gillis and numerous top juniors have tested and played the shafts. 

According to Krampel, the 67 (S-flex), 68 (X-flex), and 69 (XX-Flex) gram versions have been adjusted for American markets after testing with various players and fitters. They’re now built to have thicker handles and stiffer tip sections than the Korean versions. Monstar also has a range of options including 50-gram and ladies shafts.

The shafts indeed have titanium rods that run from the butt-end to the tip section in order to reduce weight while increasing stability. They’re designed to produce a high-launch, low-spin ball flight.

Krampel said he expects the company’s new website to go live within the next week, where American customers will be able to purchase shafts.

On Tuesday at the Rocket Mortgage Classic, spotted a “Monstar Full Titanium” shaft in Brandon Matthews’ new Srixon ZX7 Mk II driver.

I quickly checked out the photos of the shaft, but I was equally stumped.

Monstar? Is that like the Monstars from Space Jam?

Whenever I don’t know something about a golf product – whatever it is – my first text is always to equipment expert, and Club Junkie podcast host, Brian Knudson. Not much gets past him in the world of golf equipment, especially when it comes to shafts.

“Never heard of them,” he replied.

Hm. That’s weird.

The alarm bells were officially ringing in my head, so I started asking around to some of the tour reps who were on site at Detroit Golf Club for the Rocket Mortgage Classic.

Every single person I asked, though, had no idea what the shaft was.

Time to get Googling.

My Google search for “Monstar full titanium golf shaft” returned an oddly scarce amount of results.

Alright, what the heck is going on with this Monstar shaft? What IS IT?!

I then tracked down Matthews, who helped shed some light on how the shaft ended up in his bag, but not much by way of design or technology.

Here’s what Matthews had to say:

I got it a couple years ago from a guy I know. I guess it’s from overseas in Asia. I think it’s similar to – I guess not similar to – but in the category of the AutoFlex. It’s not as whippy, though. My buddy had one and he was like, ‘Hey, can you try this out?’ Actually, this was the shaft I won with last year at the [2022 Astra Golf Championship on the Korn Ferry Tour]. I don’t know the ins and outs of it, but it works. It’s really sweet.

At this point, my intrigue was off the charts.

A bit more digging helped me find a GolfWRX forum thread about the Monstar shafts, which then led me to a Korean blog called “Love Golf.”

Unfortunately, the website is in a foreign language, and the formatting of the blog wasn’t allowing me to Google translate. I found a work-around with the help of Artificial Intelligence, though, and I was able to decode what was written about the Monstar shafts.

Here’s the A.I. translation of the Love Golf blog, which provides seemingly reliable design details:

“Hello. This is Love Golf. Today, we’re going to talk about the full titanium Monstar shaft, which is made with an inserted titanium wire. What’s good about having titanium inserted – its resilience is overwhelmingly good. Of course, good resilience would greatly help with direction and distance.

“This Monstar shaft is available in our store. It is Made in Japan. From the Japanese Arute Corp., a company with a 30-year tradition and boasting an overwhelming production share in carbon-pole shafts. With their unique carbon manufacturing technology and the expertise accumulated over the years, they have finally launched a new product, the 2018 Full Titanium Reinforced Monstar shaft. 

“The inner diameter of the Full Reinforced Shaft uses a mix of 60T carbon, which has a strength more than twice that of steel, and an elasticity rate more than five times. During a swing, it supports the force, maintains Low Torque at impact, significantly suppresses twisting, and is significantly smoother than a shaft with the same stiffness CPM. Even though it is lightweight, it outperforms a shaft of the same weight in terms of resilience.

“The Monstar Full Titanium shaft is also the first in the industry to reinforce from the tip start point to the butt end with Titanium Wire, delivering power from the start of the swing impact to the end of the follow through at the butt end, delivering energy so that the ball can fly to the end with impact.

“The Monstar shaft, with the insertion of Full Titanium Wire, has the advantage of being more than 10g lighter, allowing for easier head speed increase when swinging. As a result, it is the ultimate carbon shaft that allows all players to significantly increase their distance and tolerance by solely relying on the shaft.

“In the past, Honma came out with a full titanium shaft. I remember being surprised when sparks flew while cutting the shaft for fitting, even though it was carbon…That Monstar shaft will probably also have sparks flying.”

Some additional research also led me to a YouTube video from Tour Experience Golf (TXG), where the expert fitters tested out the shaft. In the video, they compare the Monstar shaft to the popular pink AutoFlex shaft, which is known for its uniquely whippy construction. As described in the video, however, the AutoFlex X-Flex measures about 210 CPM (cycles per minute), while the Monstar X-Flex measures a more standard 280 CPM.

Matthews himself plays a Monstar Full Titanium XX-Flex shaft, which measures 69 grams, based on the shaft label.

It’s extremely important to keep in mind here that Matthews is currently ranked No. 2 in Driving Distance on the PGA Tour in 2022-2023, averaging 321.8 yards per drive.

To me, that means two things:

  1. Brandon Matthews is a different kind of beast (a mon-ster, if you will), and,
  2. The Monstar Full Titanium shaft, with its “titanium wire,” is clearly stable enough to withstand Matthews’ other-worldly speed. Surely it can also withstand the speeds of other fellow pros and amateurs, too.

I reached out to the company for further information, but I’ve yet to hear back at the time of publishing. I’ll be sure to update this story should more details become available, and hopefully I’ll be able to test out the shaft for myself in the future and report back. From the sounds of it, this shaft won’t be easy to get my hands on. Hopefully, Matthews’ buddy has another one on deck…

Until then, check out the photos of Matthews’ Monstar shaft here

Your Reaction?
  • 138
  • LEGIT20
  • WOW21
  • LOL6
  • IDHT2
  • FLOP1
  • OB1
  • SHANK10

He played on the Hawaii Pacific University Men's Golf team and earned a Masters degree in Communications. He also played college golf at Rutgers University, where he graduated with a Bachelor of Arts in Journalism.



  1. Guy Sykes

    Jun 28, 2023 at 12:25 pm

    Interesting read and surprised to see titanium coming back to shafts. In the late 80’s/early 90’s there were all titanium shafts available made by Sandvik Titanium in Richland, Wa. Called TI Shafts they were very lightweight in different flexes (not auto flex) and at the time pretty expensive. I ran a golf club repair business and had a set in both woods and irons and they played extremely well. Very lightweight through the set. Sandvik is still in business but no longer makes shafts.

    • F

      Jul 2, 2023 at 12:54 pm

      I had one in one of my Taylormade Burner metal drivers in 1991. It was really good

  2. J14

    Jun 28, 2023 at 11:20 am

    I had Titanium iron shafts 20 + or so years ago. Stiff and much lighter than steel.

    Very accurate — Very expensive.

  3. Www

    Jun 28, 2023 at 11:08 am

  4. Jimbo88

    Jun 28, 2023 at 9:16 am

    Tursky: Did you speak with James Chang (the Korean writer/golfer who contributes to GolfWRX:, to see whether he can share insights w.r.t. Monstar shafts? (given its likely Korean origin… and given that James has been exploring these lightweight shafts e.g. AutoFlex and FreeFlex?

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.


Odyssey Ai-One: Artificial Intelligence comes to putters



We spotted Odyssey’s new Ai-One and Ai-One Milled putters down the stretch of the PGA Tour season and were able to photograph them on the putting green at the Shriners Children’s Open three weeks ago.

And we didn’t just spot the wands on the putting green; they wound up in some pretty big-time bags pretty quickly.

Jacob Davidson, GM of Odyssey Golf and Callaway VP of Global Tour spoke to this:

“We knew we had a great product when we launched this because the testing results came in so strong, but the one thing that I think we were a little bit, maybe not surprised, but excited about was early on – this putter captured the attention of the best players in the world. This putter is already in the bag of a number one player in the world (Ruoning Yin). This putter is already in the bag of our Masters Champion (Jon Rahm). This putter is already in the bag of someone that made a switch at the Tour Championship (Sam Burns)…the same player has never made a switch in putter since he turned professional in 2017.”

Given all of the aforementioned, intrigue abounded at GolfWRX HQ and in the GolfWRX forums around Callaway/Oddysey’s apparent application of artificial intelligence to putter design. Speculation about the cutaways behind the putter faces and what exactly was being showcased was rife as well. A putter face designed leveraging the powers of artificial intelligence, perhaps?

In a word, yes.

Odyssey today unveiled its Ai-One and Ai-One milled putters, which leverage the company’s Artificial Intelligence design and super-computing capabilities, honed in recent driver faces, to create what the company is calling “the most advanced insert in golf.”

What this means visually is a unique contour pattern on the back of the insert face designed to minimize speed loss on off-center putts and expand the sweet spot. Translation: Putts that finish up to 21 percent closer to the hole, according to Odyssey.

Detail of the rear side of the Odyssey Ai-One putter face.

Introducing the putter line, Luke Williams Sr. Global Director at Odyssey said:

“We’ve designed two different putters under this Ai-One umbrella with really two different objectives. We have the milled line, the champagne-colored insert which is a milled titanium insert in a milled stainless steel head. So you get that look and feel of a milled putter, that is very important to us, to have the feel of that be consistent with what players that use milled putters expect, but with performance you wouldn’t get from a typical milled putter.

“And then we also knew that we wanted to have a White Hot version or a urethane softer feeling insert because that’s what through the years has really had the most decided advantage in the marketplace and really has become what we’ve been most known for, so that insert is a combination of an aluminum back section which has the contours which deliver the consistent ball speed married and co-molded to a White Hot urethane on the front. And that delivers the soft feel and the sound that that players have come to love for White Hot, so those are the two types of inserts – they both have tremendous performance.”

Let’s dig in further.

Odyssey Ai-One putters

At the heart of the Ai-One tech story is the Ai-One insert. A contoured aluminum insert is co-molded to the back of Odyssey’s famed White Hot insert in a bid for enhanced forgiveness and a larger sweet spot. Also notable from a feel standpoint: the White Hot insert is grooved.

Rightly proud of the innovation, Odyssey engineers developed a Panlite window to showcase the face technology behind a layer of automotive-grade polymer. The window is positioned in different locations on blade and mallet models.

Deviating from the traditional black exterior, engineers elected to use a blue PVD finish across the line.

5, 10, 15, and 20-gram weights may be used interchangeably to dial in head weight. Also, the latest iteration of Stroke Lab is a steel SL 90 shaft, which features up to 30 grams of weight in the butt end for counterbalancing.

Pricing, specs, and availability

  • At retail and online: November 3
  • Price: $299.99
  • Head shapes (November 3): #1, Double Wide DB, Rossie S, #7S, and #7CH
  • Head shapes (February): #2, Double Wide CH, Rossie DB, #7 DB, 2-Ball DB, CH, Jailbird Mini CH, DB

Family portrait, below.

Odyssey Ai-One Milled putters

Similar to the Ai-One, the insert design is essential to the Odyssey Ai-One Milled putter story. For this premium, milled stainless steel model, engineers utilize an A.I.-designed titanium insert to again achieve a larger sweet spot and enhanced forgiveness, minimizing speed loss on putts struck away from the center of the face.

Again, engineers implemented a blue PVD finish, and 5, 10, 15, and 20-gram weights may be used interchangeably to dial in head weight. The steel SL 90 shaft is standard here as well.

Pricing, specs, and availability

  • At retail and online: November 3
  • Price: $449.99
  • Head shapes: One T, Two T, Three T, Six T, Seven T DB, Seven T CH, Eight T, and Eleven T

Family portrait, below.

Check out more photos of Odyssey’s Ai-One putters here.

Your Reaction?
  • 7
  • LEGIT4
  • WOW3
  • LOL0
  • IDHT0
  • FLOP0
  • OB0
  • SHANK2

Continue Reading


Cam Young spotted with 1-of-1 Titleist 631.CY irons



Add another player to the list of golfers playing custom Titleist muscleback irons.

Cameron Young was spotted with “631.CY” irons in the bag ahead of the World Wide Technology Championship, gaming the new clubs in his 6- through 9-irons.

Young looks to be joining Adam Scott, Webb Simpson, and Justin Thomas in playing custom Titleist irons.

Image c/o

According to’s Sean Martin, the difference between Young’s 631.CY irons and off-the-rack Titleist 620 MB irons is the sole of the club. Owing to Young’s steep delivery and substantial shaft lean, Titleist had been grinding the soles of his 620 MB irons to add bounce in his short irons. 631.CY irons are forged with extra bounce.

“The short irons in the 631.CY’s have a little more leading-edge bounce, and then they float to a little bit wider sole than the 620 MB’s into his 6-iron,” Titleist’s Titleist’s Director, Player Promotions, J.J. Van Wezenbeeck said. “All the (631.CY’s) are higher-bounce than the 620 MB’s, but there’s also a little more sole width as you graduate (through the set).”

Image c/o

As Van Wezenbeeck indicates, the longer irons have slightly wider soles, which lowers the clubs’ center of gravity for higher launch. For example, Van Wezenbeeck said Young is hitting the 631.CY 6-irons 1 to 1.5 degrees higher.

Young will continue to use a 2023 Titleist T150 3-iron and T100 4- and 5-irons. He uses a Vokey Design SM9 wedge instead of a set-matching PW.



Your Reaction?
  • 4
  • LEGIT2
  • WOW0
  • LOL0
  • IDHT0
  • FLOP0
  • OB0
  • SHANK0

Continue Reading

Whats in the Bag

WITB Time Machine: Matt Kuchar, 2018 World Wide Technology Championship



Matt Kuchar finished a stroke ahead of Danny Lee at El Cameleon in 2018 with his beloved Bridgestone J15CB irons in the bag along with some other regular arrows in his quiver, including a Bettinardi Kuchar Arm Lock flatstick.

Check out Kuchar’s full setup from his 2018 triumph in Playa del Carmen below. 

Driver: Bridgestone Tour B JGR (9.5 degrees)
Shaft: Fujikura Atmos Tour Spec 6S

3-wood: Titleist TS2 (13.5 degrees)
Shaft: Fujikura Speeder Evolution 757 X

Hybrids: Bridgestone Tour B XD-H (18 degrees), Ping Anser (20)
Shafts: Fujikura Motore Speeder TS 8.8 X flex

Irons: Bridgestone J15CB (5-PW)
Shafts: True Temper Dynamic Gold 105 S300 (soft stepped)

Wedges: Bridgestone J40 Forged (52 degrees, bent to 51); Cleveland RTX-4 (58 bent to 57, 64 bent to 63 degrees)
Shafts: Aerotech Steelfiber i110X, KBS Tour 120 S, KBS Tour 120 S

Putter: Bettinardi Kuchar Model 1 Arm Lock (400 grams, 3 degrees loft, 71 degrees lie, 40.5 degrees)
Grip: Bettinardi Arm Lock XL

Ball: Bridgestone Tour B X

Grips: Iomic


Your Reaction?
  • 1
  • LEGIT0
  • WOW0
  • LOL0
  • IDHT0
  • FLOP0
  • OB0
  • SHANK0

Continue Reading