1、Product Material: Made of AL7075 aluminum alloy + ceramic bearing material, ceramic bearing, light weight, high lubrication, durable. 2、Tooth Shape: Specially optimized tooth shape, synchronized with the chain drive direction, so that the chain can be disconnected more smoothly. 3、Tooth Marks: Deepen tooth marks, clearer gear shifting, more stable windings, providing users a good using experience. 4、Product Color: The optional colors are red, blue, gold, black and seven colors, you can choose according to your preferences. 5、Applicable Models: Bicycle rear derailleur pulle is suitable for most of the rear derailleur on the market, support 7/8/9/10 speed. Item Type: 17T Ceramic Rear Derailleur Pulley Guide Material: AL7075 Aluminum Alloy + Ceramic Bearing Weight: Approx. 18g/0.6oz Diameter: Approx. 68mm/2.7in Installation Size: Approx. 4/5/6mm / 0.16/0.2/0.24in Axle Advantages: Applicable to Most Rear Derailleur on the Market, Supporting 7/8/9/10 Speed 1 x Rear Derailleur Pulley Guide 2 x Axle 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.