[Bicycle Seatpost]: This seat post features an adjustable length design to accommodate different heights and riding positions. It's suitable for bow shaped cushions. This adjustable seatpost can absorb the oscillation during riding to provide a comfortable cycling experience. [Premium Material]: This bike seat post is made of aluminum alloy, ensuring durability and longevity for your biking adventures. Clear Scale, provides clear and smooth adjustment of the seat post length. [Lightweight Design]: The aluminum alloy construction not only provides strength but also keeps the weight down, making it an ideal choice for those who value speed and efficiency. [Easy to Install]: The bike seatpost is easy to use, ensuring riders a comfortable riding experience. Length: 30cm/11.81inch. Specification:25.4x300mm,27.2x300mm, 28.6x300mm, 30.8x300mm, 31.6x300mm [Wide Applications]: Our bike seatpost is suitable for most mountain bikes, road bikes, folding bikes, fixed gear bicycles, BMX, etc. [Note] The seat tube should be purchased according to the size, the general seat tube has a scale "how much to buy", must be suitable to install oh! Colour:Black Material:aluminum alloy Package Contents: 5 x Bicycle Seatpost Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.