Absolute Black ultralight 7075Txxx aluminium CNC chainring narrow-wide type for monoring 9-10-11-12 speed drivetrains. Available in this standards : Cannondale Direct Mount - Sram Boost 148 Direct Mount - Sram BB30 Direct Mount - Sram BB30 Oval Direct Mount - BCD 64 4 holes - BCD 104 4 holes Oval. Black or red anodized, 28T-30T-32T. Weights from 39 grams. Designed and produced inside UE.