Description Made from durable and high-quality aluminum alloy material, which worth of your trust, lightweight and durable. Measure the diameter of the seat tube before perchase. Suitable for MTB bike, mountain bike, road bike etc. Features - Color: Black. - Material: Aluminum alloy. - Size: 6.20 x 3.30 x 3.30cm/ 2.44 x 1.30 x 1.30 inch. - Bike seat tube reducer sleeve is made of aluminum alloy machining. - The product with surface anodizing, strong and rustproof, lightweight and durable. - Full precision machining, anti-slips. Use this seatpost sleeve adapter ring, you can change the bike seat tube to the size you want. - Suitable for MTB, mountain bikes, road bikes, etc. Efficient and convenient, it is the best choice for your ride. - Exquisite processing technology, simple and elegant, multi-size bike seatpost tube reducer sleeve easy to adjust the diameter, bring the convenience to your travel. Bike seat tube reducer sleeve is made of aluminum alloy machining The product with surface anodizing, strong and rustproof, lightweight and durable Full precision machining, anti-slips Use this seat post sleeve adapter ring, you can change the seat tube to the size you want Suitable for MTB, mountain bikes, road bikes, etc