For serious racers centering on fat benefits, XRAY's optional CNC-machined stopping system disk adapter is CNC-machined from tough 7076 T6 alu, and possesses now been strategically lightened by 30percent set alongside the standard #334140 adapter. Rotating mass is repaid and never have to sacrifice power or durability. Includes factory-pressed pins (non-replaceable). - Lightweight stopping system disk adapter - Tough 7075 T6 aluminum - CNC-machined - Strategically lightened by 30per cent