2pcs Bicycle Rear Derailleur Pulley 10T/11T/12T/13T/14T/15T/16T/17T Aluminum Alloy Jockey Wheel Ceramic Guide Pulley Bike Guide Roller Wheel for 4/5mm Guide Wheel (13TColourful)

Specifications Type: Rear Guide Wheel Material: Aluminum Alloy + Ceramic Colour: Black/Colourful Teeth: 10T/11T/12T/13T/14T/15T/16T/17T Features 1. Adopting quality aluminum alloy this product is durable to use 2. Positive and negative tooth guide wheel no strange vioce and faster speed 3. Ceramic material can reduce drag force which can improve cycling efficiency 4. Stronger compatibility with flexible rotation 5. Suitable for use 4 / 5 guide wheel screws Package include 2 * Rear Guide Wheel 2 * Installation Hole Adapters