Shimano Saint RD-M820 Rear Derailleur Pulley Set Description: The Saint RD-M820 Rear Derailleur Pulley Set is a factory replacement set that consists of a tension and a guide pulley. These pulleys feature 11 teeth, have a sealed bearing in the middle for low friction and less maintenance, and a plastic body that reduces the noise of the chain going through the derailleur. Features: Includes the guide and tension pulleys, bearing covers, and the central bushing that creates a secure fit over the bolt that holds the derailleur pulleys in the rear derailleur cage plates Guide Pulley Bolts and other hardware sold separately Stock pulley set for the Shimano Saint RD-M820 10 speed rear derailleurs, and these pulleys will also fit into Shimano XTR RD-M985-GS and XTR RD-M985-SGS 10 speed rear derailleurs