RaceFace Turbine Chainrings are designed for optimal shifting performance and minimal weight, in 11-speed off-road applications. FEATURES : Asymmetrical tooth profiling and up-shift/down-shift zones create smooth and quiet shifting under load Three times stiffer than Race Face Team chainrings without additional weight gain CNC-machined from 7075 aluminum Sold as a set SPECS : Color: Black Material: Aluminum Tooth Count: 24 , 34 Ring Position/Type: Inner , Outer Drivetrain Speeds: 11 Chainring BCD: 104 , 64