Angular Contact Ceramic Hybrid bearing kit replaces bearings in SRAM GXP bottom brackets. Works for GXP outboard bottom brackets, GXP press-fit (BB86, BB92) bottom brackets, and the following RWC bottom brackets: Outboard GXP, KCNC PF30 x GXP, KCNC BB86 GXP, KCNC BB92 GXP, KCNC BB30 x GXP. Bearings have chromium steel races and Grade 5 ceramic ball bearings.