Features： 1、Made of high-quality aluminum alloy, with nice durability, high strength and lightweight, wear resistant and is not easy to rust. 2、Hydraulic shock absorber, no matter what height is adjusted, it can effectively absorb shock, increase riding comfort and make it safer. 3、Manually adjust the height of the seatpost, 0-100mm adjustable, with a clear scale, to meet people of different heights. 4、With diameter conversion sleeve, the seatpost diameter can be converted from 30.9mm to 31.6mm, which can easily solve the problem of inconsistency in size. 5、Delivery includes a wrench for easy replacement of seatpost clamps. It is suitable for MTB, mountain bike, road bike, etc. Specification： Features: Made of high-quality aluminum alloy, with nice durability, high strength and lightweight, wear resistant and is not easy to rust. Hydraulic shock absorber, no matter what height is adjusted, it can effectively absorb shock, increase riding comfort and make it safer. Manually adjust the height of the seatpost, 0-100mm adjustable, with a clear scale, to meet people of different heights. With diameter conversion sleeve, the seatpost diameter can be converted from 30.9mm to 31.6mm, which can easily solve the problem of inconsistency in size. Delivery includes a wrench for easy replacement of seatpost clamps. It is suitable for MTB, mountain bike, road bike, etc. Specifications: Type: Without Diameter Conversion Sleeve / With Black Diameter Conversion Sleeve / With Silver Diameter Conversion Sleeve(optional) Color: Black Material: Aluminum Alloy Post Diameter: 30.9mm / 31.6mm(optional) Length: 375mm/ 14.8in Weight: 30.9mm: 695g/ 24.5oz              31.6mm: 705g/ 24.9oz Packing List: 1 * Seatpost 1 * Diameter Conversion Sleeve 1 * Wrench Package List： 1 * Seatpost 1 * Diameter Conversion Sleeve 1 * Wrench