Precision-engineered Dura-Ace design results in crisp & reliable shifting every time 9- or 10-speed compatible Sealed pulley bearings reduce friction & run longer Extension coil spring & self lubricating micro-machined bushings reduce friction for low-effort shifting Pulleys are made from tough Du Pont Zytel for longer life & less chain noise Polished Dura-Ace finish & graphics Weight: 180 grams