<p>Anodized CNC machined bicycle jockey wheel with fully rubber sealed bearing for center bolt derailleurs. Fits for most of rear derailleur on the market, support 7/8/9/10 speed.If you need it will be your best choice. Wish you a happy life!</p> <p>Features:</p> <p>1. It is made of CNC aluminum alloy, lightweight and durable.</p> <p>2. Anti rust and corrosion resistant anodized.</p> <p>3. Apply for most of rear derailleur on the market, support 7/8/9/10 speed.</p> <p>Specifications:</p> <p>Material: 7005 Aluminium Alloy</p> <p>Components: Derailleurs</p> <p>Structure: Ceramic Bearings</p> <p>Color: Red</p> <p>Size: 11T</p> <p>Use: For 7/8/9/10 speed</p> <p>Diameter: 11T-40mm</p> <p>Quantity: 2pcs</p> <p>Fit For: For 4/5/6mm roller screw axis</p> <p>Package Included:</p> <p>2 Pcs Ceramic Bearings</p>