Polished and then chemically treated to achieve a basic level of corrosion resistanceChamfered shifting edges, solid plates and hardened solid pins to safeguard durabilityCompatible with modern 9/10/11sp narrow/wide chainringsCompatible with all Box Prime 9 drivetrains9sp1/2x11/128126LSilver312gUPC/EAN/GTIN: 639266097365