TheRaceFace X-Type Team XC Bottom Bracket is designed to be used with X-Type or EXI cranksets. Manufactured from high strength aluminum & featuring custom retainer bearings. Race Face BB cups are also compatible with various Shimano and FSA external BB systems, making for a great upgrade. RaceFace X-Type Team XC Bottom Bracket Features BB Cups are forged & CNC machined from 6066 aluminum. Tapering wall construction to minimize weight. Custom 6805 16 ball retainer bearing Bearings feature our custom triple wiper seal to better retain grease & keep contaminants out. Bearings are factory filled with Phil Wood waterproof grease ÔÇö tested & proven to extend bearing life. Interchangeable with select Shimano and FSA external MOUNTAIN BB systems. Fully serviceable with BBEXITOOL