These derailleur pulley wheels see extensive use and tend to be high wear service items. When they reach the end of their service life, they should be replaced with original Campagnolo replacement parts. This Record 10 speed derailleur pulley set kit is sold with upper and lower pulley wheels and intended for factory replacement of all Campagnolo 10 speed rear derailleur pulley wheels.

Both wheels are constructed from a dense rubber compound, which grips the chain while it is being passed through the derailleur. The upper and lower pulleys rest on a high quality ground steel bearings with silver alloy caps for reduced friction. These bearings greatly reduce friction to provide very low resistance. Derailleur fixing bolts are not included; these bolts are expected to be reused from existing rear derailleur.