FSA Super Road Chainrings are designed to provide flawless shifting, with minimal weight and unmatched durability. FEATURES: Precision CNC machined AL7075/T6 alloy Shifting ramps and stainless steel pins on outer rings N-11 chainrings are compatible with all 10 speed drivetrains, and compatible with FSA, SRAM and Shimano 11- speed drivetrains SPECS: Color: Black/Silver Material: Aluminum Tooth Count: 50 Ring Position/Type: Outer Drivetrain Speeds: 10 , 11 Chainring BCD: 110