The Campagnolo Super Record 12-Speed Rear Derailleur in black is a high-quality component designed for road bikes, cross bikes, universal bikes, trial bikes, cyclocross bikes, and racing bikes. Made of carbon fiber, this derailleur weighs only 181 grams and features a medium cage derailleur cage length. It is specifically designed for Campagnolo components and offers precise gear changes for optimal performance on the bike. Whether you are a professional cyclist or a casual rider, this rear derailleur is a reliable and durable choice for enhancing your biking experience. Original owener, Campy pulleys are basically new, Original box. Not working, for parts. Includes some Campagnolo spare parts, spare parts not complete.