Durable and super smooth Upgrading your bike with little details is so nice to do! The AluBoys will lift your bike to a higher level easily. The aluminium derailleur pulleys are super durable and make your chain roll super smooth over the teeth. The ceramic bearings make sure that the pulleys itself will roll super smooth and will last longer. Our most high-end deraulleur pulleys to give the finishing touch to your bike. 7075 aluminum derailleur pulleys. Extra stiff for fast shifting. High-quality sealed ceramic bearing. Super smooth and durable. 11T. Compatible with Shimano 9 and 10-speed (except RD-7900 and 7970) and Campagnolo 11-speed. Part Number: 2913612201 Barcode: 8716683074147 Product Code: BDP-22Compatible with Shimano 9, 10 and 11-speed (except RD-7900 and 7970) / Mega Range, SRAM X0/X9/X7, Apex, Rival, Force and Red (> 2011) and Campagnolo 11-speed. Discipline: Road/MTB Release Year: 2020