FSA Pro Road Chainrings deliver flawless shifting for any road drive train. FEATURES: Precision CNC machined AL7075/T6 alloy N11 chainrings are compatible with all 10 speed drivetrains, and compatible with FSA, SRAM and Shimano 11 speed drivetrains For use with 34t chainring SPECS: Color: Black Tooth Count: 50 Ring Position/Type: Outer Drivetrain Speeds: 10 , 11 Chainring BCD: 110