Brand SRAM
Weight

 
61g (26t), 66g (28t), 68g (30t), 71g (32t),
76g (34t), 91g (36t), 101g (38t), 119g (40t).
Weights are based off GXP® BB
Material Fully CNC Aluminum
Ratios Available in 26-, 28-, 30-, 32-, 34-, 36-, 38-, or 40-tooth
Recommended Group XX1, X01, X1, and GX compatible