FSA Pro Road Chainrings deliver flawless shifting for any road drive train. Features -N-11 chainrings are compatible with all 10 speed drivetrains, and compatible with FSA, and 11 speed drivetrains -N-10 chainrings are compatible with , and Campagnolo Ultra Narrow 10-Speed drive trains -S9/C10 chainrings are compatible with 9 speed and Campagnolo C10 10-Speed -Precision CNC machined AL7075/T6 alloy Item Specifications-Chainring BCD::110-Color::Black-Defined Color::Black-Drivetrain Speeds::11,10-Material::Aluminum-Ring Position/Type::Outer-Tooth Count::46