Callaway Big Bertha Beta Iron is a Japan Only Model for the player who needs tons of forgiveness and distance in a larger head size. The design is based on combining an Iron with a wood and by using an undercut inner weight and low shallow CG with a 17-4 stainless 360 face cup in the 5 thru PW irons where the short irons ( AW and SW ) are stainless with VFT technology.
Callaway Japan claims this to be the most forgiving model Callaway has ever produced especially when combined with the Graphite Design Co., Ltd. GP for BIG BERTHA an ultra ligth shaft.
This set contains of 5 Clubs; #6, #7, #8, #9 and PW
The GP for BB shaft is available in 4 flexes option which are R2, R, SR and S
it also offers Alloy Blue ( S200 and R300 ) as shaft option.