Asymmetrical tooth shape for the best wear life, chain retention and mud clearance Fits SRAM and other 8-bolt direct mount cranks Drop-Stop B is with 10/11/SRAM 12sp chain and Flat Top/Transmission chains. Not compatible with Shimano 12 speed Made in the USA from 7075-T6 aluminum alloy 65g (30t) table{border-collapse:collapse;width:100%;}td{text-align: left;padding: 8px;font-weight:350;}tr:nth-child(even){background-color:#f2f2f2}th{background-color:#eb212e;color:white;text-align:left;padding:8px;}.desc ul{font-size:24px;font-weight:600;margin-left:-25px;padding-top:35px;border-top:3px solid #f0f0f0;}.desc li{list-style:none;border-bottom:4px solid #eb212e;width:142px;} TECH SPECS Model Drop-Stop B Ring Type Single (Anti-Chain Drop) Mount 8-Bolt DM 3mm Offset Teeth 30 Oval/Round Oval Color Black