RaceFace ERA Direct Mount Chainring for CINCH, BlackThe RaceFace ERA Direct Mount CINCH SHI12 Chainring is designed for use with Shimano 12 Speed HG+ chains. RaceFace bonded a carbon fiber spider with stainless steel teeth and a premium 7075 aluminum CINCH interface to offer a chainring that is expected to last 5 times longer than a typical alloy chainring. ERA is a chainring without compromise. Carbon fiber spider compressed and co molded using the same process we developed for ERA carbon cranks Tried