Features: Elevates your cycling performances with this Mountain Bicycles Pulley Wheel, a 12T 11 speed rear derailleur repair set designs for great compatibilities. Craft from plastic with Seal bearing, this pulley wheel ensures a smooth riding by reducing frictions and maintaining consistent chain tension during shifts. Great for cycling enthusiasts and professional riding person who demand precisions and reliability in their gear shifting experience. Whether tackling steeps inclines on mountain trail or through city road, this pulley wheel set provide the necessary support for efficient bike handling. Upgraded your bicycles functionality with this easy to install guide wheel that enhances gear shifting. Specifications: Materials: Plastic Color: As The Picture Shows Package Weight: approx.30g Inner Diameter: approx.0.50cm/0.19in Large Wheel Diameter: approx.5.8cm/2.28in Small Wheel Diameter: approx.5.0cm/1.96in Package Includes: 1 Set of Rear Derailleur Pulley note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!