Features: 1. Aluminum alloy guide wheel body, lightweight, high strength, anti-rust and durable. 2. The ceramic bearing has good performance in rolling smoothly with great stability, low chance of getting chain stuck. 3. Compatible for most of rear derailleur on the market and support 9/10/11 speed. 4. Fit for 4/5mm roller screw shaft with the screw shaft adapter. 5. A must-have replacement part for your bike. Specification: Material: Aluminum Alloy Optional Color: Black, Red Type: 14T Fit for 4 / 5mm roller screw shaft Support Bike Speed: 9/10/11 Speed Size: Approx. 58mm/2.28in Weight: Approx.20g/0.71oz Packing List: 1 x Bike Rear Derailleur Pulley 1 x 4mm Screw Shaft Adapter 1 x 5mm Screw Shaft Adapter
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