Race Face Single Rings - Now with performance enhancing chain retention technology. Burly enough for DH Racers and Dirt Jumpers, yet light enough for XC / singlespeed. Single Rings are machined from 7075 aluminum and tested in some of the most punishing riding terrain - Built to last. Key Features: Narrow Wide tooth profiling ensures ultimate chain retention.,Stiff 4mm plate thickness and I-beam construction transfer loads without flexing.,7075-T6 aluminum, aerospace grade strength.,Reversible laser etched graphics..