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2021 Srixon ZX4 irons: The final piece of the ZX puzzle



When it comes to building the perfect set of irons, there are endless options, and to help golfers get the most from their iron games, Srixon is completing its ZX iron series with the introduction of the all-new hollow-body ZX4 for 2021.

Considering the recent success of the already popular ZX7 and ZX5 irons, which were released a few short months ago, and the growing popularity of Srixon irons on tour and with consumers, the addition of a fast hollow-body iron makes a lot of sense, given Srixon’s ability to create fast, forgiving, and beautiful looking clubs packed with technology.

“The new Srixon ZX4 irons mark a new revolution in forgiveness for Srixon. The irons include a fully hollow construction with wide soles for getting the center of gravity extremely low and providing maximum forgiveness from the turf.

The ZX4 irons accomplish this in addition to Mainframe technology, Tour V.T.Soles, tungsten weighting, and the look and feel expected with Srixon ZX irons.”

-Dustin Brekke, Director of Engineering at Srixon.

More photos of Srixon ZX4 irons in the forums. 

2021 Srixon ZX4 irons: Technology

The ZX4 irons share the same face technology as the ZX5 and ZX Utility known as “MainFrame.” This MainFrame face creates a unique thickness optimization for each iron in the set based on tested strike patterns and was refined using machine learning AKA AI. These varying thickness patterns are all individually milled into the rear of each face (made up of grooves and cavities) to expand the COR.

The face itself is made from forged HT1770 maraging steel and attached to a 431 steel body for great ball speeds and soft feel. Inside of the 431 stainless steel body of ZX4 mid and long irons is high-density tungsten in the sole to lower the center of gravity, boost forgiveness, and help promote high-launching shots.

More photos of Srixon ZX4 irons in the forums.

The other key design feature that sets the ZX4 apart from other irons in the hollow-body category is Srixon’s Tour VT sole to improve the performance through the turf compared to an iron of similar sole width.

Over the years, the VT Sole has gone through some changes, which resulted in softer lines and smoother edges.

In the new ZX series, Srixon returns to its roots with a move aggressively angular VT sole, including well-defined heel and toe notches for improved turf interaction.

More photos of Srixon ZX4 irons in the forums.

Just because the ZX4’s are designed to be game improvement doesn’t mean they can’t offer “players iron-like control.” They achieve this with progressive grooves through the set. The 8-iron through pitching wedge have sharper, narrower, and deeper grooves to channel moisture and debris away more efficiently to generate more spin and shot-stopping control on approach shots.

When compared to the rest of the new Srixon iron series—which includes the ZX7 and ZX5—the ZX4 fits nicely between the ZX5 and utility and offers an extremely clean look from address. Not only that, but the blade lengths have all been configured so golfers that plan to use the ZX4 to build combo sets will see a smooth transition from one iron to the next and even into the new utility.

Price, specs, and availability

The ZX4 irons will retail for $1,299.99 (for an 8 piece set) in steel and $1,399.99 (for an 8 piece set) in graphite.

  • The stock steel shaft is the Nippon NS Pro 950GH Neo.
  • The stock graphite option is the UST Recoil 760/780.

The Srixon ZX4 will be available for pre-order starting February 22 and will be on retail shelves on March 5.

More photos of Srixon ZX4 irons in the forums.

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Ryan Barath is a club-fitter & master club builder with more than 17 years of experience working with golfers of all skill levels, including PGA Tour players. He is the former Build Shop Manager & Social Media Coordinator for Modern Golf. He now works independently from his home shop and is a member of advisory panels to a select number of golf equipment manufacturers. You can find Ryan on Twitter and Instagram where he's always willing to chat golf, and share his passion for club building, course architecture and wedge grinding.



  1. Pingback: Best irons in golf of 2021: Top overall performers – GolfWRX

  2. Steve O

    Feb 9, 2021 at 10:20 pm

    Come on doubters — there’s a reason for variable gaps. Engineers with months of testing to come up with a complete set have 10,000% more cred than the unseeing and unbelieving.

  3. k

    Feb 9, 2021 at 4:01 pm

    i’m turned off by the lofts. first thing i do is look at the pw. if its anything less than 45 the irons are out in my book.

  4. DB

    Feb 9, 2021 at 8:50 am

    These are cool but 2-degree and 2.5-degree gaps in the long irons is practically useless for most people. Especially amateurs, they probably need at least 3.5-4 degree gaps in the long irons. Even lots of pros have 3-4-degree gaps in the long irons.

  5. Arthur L

    Feb 8, 2021 at 8:28 pm

    The lofts are a joke. Too bad cause they look very sweet

  6. 8 iron bomber

    Feb 8, 2021 at 3:05 pm

    I’m not that offended by like lofts, but this gapping is a joke.

  7. gwelfgulfer

    Feb 8, 2021 at 2:15 pm

    2* of difference at the top of the bag, but 6* at the bottom… Come on…

  8. Jordan

    Feb 8, 2021 at 9:23 am

    lol what is “player’s iron like control” on a 28* 7-iron? I’d be trying to control that thing on its way to the Moon.

    • Daniel Whitehurst

      Feb 8, 2021 at 10:57 am

      Next year these irons will have MCT or Moon Control Technology.

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New Mizuno JPX923 irons: Everything you need to know



What you need to know: Mizuno is launching the successor to its JPX921 series. Engineers leveraged the company’s custom-fitting program — including data from 350,000 golfers — in the creation of the JPX923 series, which includes five models: JPX923 Tour featuring a new V-Chassis and thinner topline, JPX923 Forged with features Mizuno’s third generation of chromoly forging, JPX923 Hot Metal, JPX923 Hot Metal Pro, and JPX Hot Metal HL all featuring new, faster 4335 nickel chromoly, which is 35 percent stronger than Mizuno’s original chromoly.

Mizuno JPX923 irons: What’s new, key technology

JPX923 Tour

Featuring a copper underlay for “Mizuno feel,” the JPX923 Tour is one-piece Grain Flow Forged in Hiroshima Japan from 1025E Pure Select mild carbon steel. Narrower top line and sole in tandem, more rounded trailing edge for cleaner turf interaction.  Features Mizuno’s new ‘V-Chassis’.

“The goal was to engineer a compact, players cavity back that looked and felt like a muscleback at impact. With the copper underlay and new topline, the JPX923 Tour is right there,” says David Llewellyn.

JPX923 Forged

Mizuno’s third-generation of chromoly forging places a wider milling slot heel to toe in the 4120 chromoly 4 through 7-irons as well as well as a thinner clubface. JPX923 Forged are mid-sized, full body Grain Flow Forged irons with a thinner topline and bevelled sole throughout. The scoring irons (8-GW) also feature more compact design and are forged from 1025E Pure Select mild carbon steel.

“The new JPX923 Forged pulls off two impressive achievements. First it feels more solid even though it’s faster from the face. Second, it looks sleeker with a thinner topline and narrower sole even though it plays more forgiving,” says Chris Voshall, Mizuno’s Director of Product.

JPX923 Hot Metal, Hot Metal Pro, Hot Metal HL

With the JPX923 Hot Metal, Mizuno introduces “4355 nickel chromoly,” which is 35 percent stronger than the original Hot Metal material and allows for an eight-percent thinner clubface. Cup face construction works in tandem with a deep center of gravity for high launch with stopping power.

Mizuno developed Hot Metal Pro, Hot Metal and Hot Metal HL (High Launch) from 175,000 real golf swings recorded via Mizuno’s Swing DNA system and describes the three models as follows.

  • JPX923 Hot Metal Pro is a player’s speed cavity that’s compact, with minimal offset for confident ball-strikers seeking maximum ball speed. It’s suitable for low to mid handicap golfers.
  • JPX923 Hot Metal is a forgiving speed cavity suitable for mid to high handicap golfers. It features a full speed, high stability cavity for straight flight and distance.
  • JPX923 Hot Metal HL is a high launch speed cavity delivering a higher launching option for players with moderate swing speeds or aggressive shaft lean, it’s suitable for mid to high handicap golfers.

What Mizuno says

“The new JPX923 series was planned out with Mizuno’s custom ethos at its core” says David Llewellyn, Director of R&D for Mizuno. “We already offer more than 50 unique shafts within our custom program, by expanding to five iron models, there’s an ideal combination for every type of player.”

“We’re constantly evolving the JPX series based on more than 175,000 unique swings we capture every year on the Mizuno Shaft Optimizer,” says Bill Price, Mizuno’s Director of Fitting. “Recently we’re seeing an increase in the number of players with slightly slower swing speeds being fitted – and a trend to more shaft lean. Hence a slight increase in bounce angles through all the models and the introduction of the Hot Metal High Launch.”

Resident Club Junkie Brian Knudson’s take

Note: GolfWRX has not yet gotten an in-hand look at the JPX923 Tour or Forged irons. 

Mizuno’s Hot Metal HL irons look easy to hit and high flying with their larger sole and longer heel to toe shape. You can see some of the tech that is packed into these irons around the badge like the Harmonic Impact ribs and the Stability Frame. Like you would expect from Mizuno the finish quality and badging all look very good and catch your eye without the need for wild colors.

The Mizuno Hot Metal irons look to be the bread and butter of the lineup. The Hot Metal features a little smaller footprint than the HL, less offset, thinner top line, and narrower sole. The look from address will please most golfers and it is still packed with the technology for easy distance and effortless launch.

Hot Metal Pro irons are the smallest of the three but should still offer a great combination of looks and performance. They are still a little longer from heel to toe while offering the least offset and thinnest toppling of the group. The short irons are shaped really well and the whole set flows great from 4 iron down to the pitching wedge.

What they look like

JPX923 Hot Metal Pro

Mizuno JPX923 Hot Metal

JPX923 Hot Metal HL

Pricing and availability

JPX923 Hot Metal Pro: 4-PW RH and LH
JPX923 Hot Metal: 4-LW RH and LH
JPX923 Hot Metal HL: 5-SW RH only

Tour, Forged will hit retail in February of 2023. Hot Metal models at retail late September.

  • JPX923 Tour/Forged – $187.50 per club
  • JPX923 Hot Metal/Hot Metal Pro/Hot Metal High Launch – $137.50 per club

Loft comparisons to JPX921

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Mizuno introduces new JPX Fli-Hi



Mizuno has today introduced the JPX Fli-Hi in a bid to meet every golfer’s demand for greater playability and easier ball-flighting potential at the longer end of the bag.

“We see a lot of players with moderate swing speeds who hit many of their longer irons the same distance – they just don’t have the clubhead speed or consistency of strike to launch the stronger lofted clubs. The JPX Fli-Hi is designed to give those players more practical distance gaps and consistency of flight.” – Chris Voshall, Mizuno’s Director of Product

The new addition features a 17-4 stainless steel face and 431 SS body in a bid to deliver an upgrade in ball speed, while the bendable hosel allows for adjustments in lie angle.

The clubs feature a lighter crown which allows for a higher ball flight, while a re-engineered Wave Soleplate is designed to increase the effective high ball-speed area of the Fli-Hi’s clubface to deliver more consistent ball speeds.

The JPX Fli-Hi is designed to slot seamlessly in to a set, with the models from #4 to #7 designed to correspond directly to the irons they have been created to replace.

The JPX Fli-Hi range features a graduating profile from fairway wood to hybrid to maximize playability. The 20 degree (#4) has a wider fairway type profile, moving towards a tighter hybrid type shaped 29 degree (#7) with a deeper face.

With a deeper center of gravity than the replaced iron, the JPX Fli-Hi is designed to produce more predictable launch and spin rates, thereby more reliable distance gaps between clubs.

The JPX Fli-Hi hits retail this month and costs $137.50 per club.

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Whats in the Bag

Taylor Pendrith WITB 2022 (September)



Driver: Ping G410 LST (9 degrees @8)
Shaft: Project X HZRDUS Smoke Green Small Batch 70 6.5 TX

3-wood: Ping G425 MAX (14.5 degrees)
Shaft: Project X HZRDUS Smoke Green Small Batch 80 6.5 TX

Irons: Srixon ZX (3), Srixon ZX7
Shafts: Project X HZRDUS Smoke Black 100 6.5 (3), True Temper Dynamic Gold Tour Issue X100

Wedges: Cleveland RTX ZipCore (46-10 Mid, 52-10 Mid, 56-10 Mid, 60-10 Mid)
Shafts: True Temper Dynamic Gold Tour Issue X100 (46-56), True Temper Dynamic Gold Tour Issue S400 (60)

Putter: Odyssey O-Works Black 3T
Grip: SuperStroke

Grips: Golf Pride MCC, Golf Pride Tour Velvet Cord

More Taylor Pendrith WITBs

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