Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel System for Campagnolo is at the forefront of bicycle performance optimization. Every component, from the bearings to the cage, is made with the highest quality materials. The oversized aluminum pulley wheels are fitted with standard or coated CeramicSpeed bearings, which reduce friction to a minimum. The 13/19 tooth OSPW for Campagnolo guarantees 40% lower friction than a standard 11-tooth Campagnolo pulley and fits up to a 32-tooth cassette. The OSPW for Campagnolo is compatible with all Campagnolo electronic (EPS) rear derailleurs and all rear derailleurs with a mounting sleeve, regardless of age and model. Currently, this OSPW system is not compatible with Campagnolo 12-speed Record and Super Record derailleurs. In the package: Complete OSPW System for Campagnolo 11 speed EPS & Mechanical CeramicSpeed UFO TECH Bearing Oil 15 ml. Dropper Bottle for pulley Decal