The CeramicSpeed Pulley Wheels for Campagnolo 12-speed offer a narrow-wide design that provide exceptional shift performance. The symmetrical narrow-wide tooth profile ensures stable chain retention across mixed terrain surfaces with no chain friction. The pulleys have a lightweight machined alloy body for durability and long life. They are developed, designed and handbuilt in Denmark. In the box:-Two 12-tooth pulley wheels-CeramicSpeed Bearing Oil 15ml dripper bottle-Sticker sheet