This is the SRAM Force 1 X-Sync Chainring. For 1x11 or 1x10 drivetrains, SRAM offers a variety of gearing options to optimize your setup. Cassette selection combined with 1x specific front chainrings in 38, 40, 42, 44, and 46 tooth sizes give you a range of gearing options.Features: SRAM X-SYNC 1X chainrings provide the highest level of 1x performance and durability SRAM X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain control The sharp and narrow tooth profile as well as rounded chamfer edges help manage a deflected chain Mud-clearing recesses for the inner chain links and rollers CX1 X-SYNC chainrings are compatible with Quarq brand power meters Specifications: Weight: 68g (38T)/ 73g (40T)/ 75g (42T)/ 85g (44T)/ 98g(46T) Material: Machined & Lathed Chainring Finish: Grey Anodized Compatibility: SRAM 11 & 10sp chains Size/BCD: 38T-40T-42T-44T-46T/ 110BCD Recommended Groupset: SRAM Force CX1