The 13-tooth/19-tooth OSPW for Campagnolo provides a 40% lower friction over a standard 11-tooth Campagnolo pulley wheel and fits up to a 32-tooth cassette. Compatible with: all Campagnolo electronic rear derailleur (EPS) and all rear derailleur with a mounting sleeve, no matter the age and model.NOT compatible with: Campagnolo 12-speed Record and Super Record derailleurs.This product includes: Oversized Pulley Wheel System, CeramicSpeed Bearing Oil, (15ml. bottle), sticker sheet. Coated products make less friction than standard finish, and are ultra-resistant to corrosion from degreaser, water, or mud.