For weight, I find it strange that basicaly only Mizuno offers a B weight (lighter). It opens up so much in fitting the toral weight and balance
Mizuno are really the only ones that come out and say it. Basically every OEM has some way of offering lighter heads to customers using over length clubs. The big benefit ( and difference ) with Mizuno offering these different weight heads from the start vs. some other is that the less mass added after the fact keeps the COG right where it should be: Behind the center of the face. Its also different for Mizuno since many of their models are single piece forged with no badges.
Taylormade - Use one head weight to start ( for each iron ) then uses hosel weight ports, that are installed depending on the specs requested. They use a different epoxy on these so they don't just fall out when re-shafting.
PING - uses the CTP. Cool thing with PING is the CTP is right behind the center of mass ( hopefully the correct term ) so even when adding a lot of weight the Sweet spot never moves from the center of the face
Callaway - Depends on the irons GI use some hosel weights and behind badge weights ( at least they used to ), Players clubs use tip weights
Srixon - They use tip weights.
Do you know if Mizuno uses B weight heads for overlength wedges also?