Description <br> Description: <br> <br> Made of aluminum alloy, lightweight and durable. <br> Ceramics bearing, super lubricating, noiseless. <br> Apply for most rear derailleur of 12 teeth in the market. <br> Setting for 4/5/6mm spindle shaft rollers, support 9/10/11 speed. <br> A necessary accessary for your bicycle. <br> <br> Specification: <br> <br> Material: Ceramic and Aluminium alloy <br> Pulley Wheel Size(Diameter): approx. 5cm/1.97inch <br> Color: black <br> <br> <br> Package Includes: <br> <br> 1 Piece of Ceramic Bike Jockey Wheel <br> 2 Pieces Bolts <br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin