Features145mm suspension travel offers the post seat great shock-absorbing function. 2The comfortable bike suspension seatpost has a pain-relieving effect on the back area as it provides optimal shock absorption during Cycle. 3Suit for most fixed gear bikes, road bikes, mountain bike, universal bikes, etc. 4There is a warning line at the lower section of the seat tube to ensure that riding above the warning line is safe and secure. 5Two-way-bolt saddle rail clamp provides an easy to adjust, vise-like grip. Its better for very fine saddle tilt adjustments.SpecificationThe seatpost is one of the essential parts of your bicycle. A good Seatpost supports most of your weight on the bike and must withstand that weight while maintaining the appropriate angle for your ride and without moving. Features:45mm suspension travel offers the post seat great shock-absorbing function. The comfortable bike suspension seatpost has a pain-relieving effect on the back area as it provides optimal shock absorption during Cycle. Suit for most fixed gear bikes, road bikes, mountain bike, universal bikes, etc. There is a warning line at the lower section of the seat tube to ensure that riding above the warning line is safe and secure. Two-way-bolt saddle rail clamp provides an easy to adjust, vise-like grip. Its better for very fine saddle tilt adjustments. Specifications:Material: Aluminum alloy Package size: 7.5*6*39cm/ 3*2.4*15.4in Package weight: 693g/ 24.4oz Package list:1 * seat post (27.2x350mm) 3 * seat post spacers (28.6mm+30.9mm+31.6mm spacers) 2 * spannersPackage List1 * seat post (27.2x350mm) 3 * seat post spacers (28.6mm+30.9mm+31.6mm spacers) 2 * spanners