DescriptionMade 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: 6.30 x 3.40 x 3.40cm/ 2.48 x 1.34 x 1.34 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.