Newly redesigned X-Sync 2 provides better chain retention resulting in a smoother, more efficient pedal feel New aggressive tooth profile reduces friction and debris build up for superior longevity Compatible with all Sram Eagle 12-speed and Sram 11-speed 1x drivetrains Robust forged and machined aluminum for ultimate strength Designed to pair flawlessly with the Eagle chain Direct Mount 30T Boost Polar-Grey 12sp Narrow/Wide 3mmUPC/EAN/GTIN: 710845827167