Features:1. Matches well with most bicycles, such as bike, mountain bike, road bike, city bike and more. 2. Made of aluminum alloy, which is light, beautiful and precise in processing.3. Solve the problem that the size of your frame and the seat tube do not match.4. Please check your bike frame seat tube outside diameter. Measure the inside diameter of your old clamp, or measure the outside diameter of your seat tube (on your bike frame) before placing an order.5. Please contact us without hesitate if you have any questions. Notice:Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement.Material:Aluminium alloyHeight: 40-60mmColor/Style: As the picture shownincludes:1 x Seatpost Adapter Shim(Seatpost not included)",