1.[Reduce Fatigue and Increase Efficiency]: Designed for road/ mountain bike (MTB) cycling. This shock absorber bike seatpost allows you to stay in the saddle and keep pedaling even over the most extreme terrain. Consistent power output and reduced fatigue enables you to go further and faster on the bike you already own. 2.[Reduce Fatigue and Increase Efficiency]: Designed for road/ mountain bike (MTB) cycling. This shock absorber bike seatpost allows you to stay in the saddle and keep pedaling even over the most extreme terrain. Consistent power output and reduced fatigue enables you to go further and faster on the bike you already own. 3.[Material and Size]: Our bike seatpost is forged from 6061-T6 aluminium, it's 400m in length and comes in several widths including the 27.2mm 30.9mm and 31.6mm most commonly found on your bikes. NOTE: Please measure and check the diamater of your current bike seat post sizes before . Strength: 4.9 levels ultra high strength, maxium of 264lbs. 4.[Easy to Install]: The standard 27.2mm/30.9mm/31.6mm X 400mm sizing allow this suspension seatpost to fit all modern bikes and install in minutes. The shock-absorbing seatpost from reduces the impact from uneven terrain, ensuring you have a smooth ride, no matter what you meet on the trail.