A. This mountain bike aluminum seat post is made of aluminum alloy. It is strong and lightweight, effectively reducing the weight of the bike body and improving riding flexibility. B. It comes in a variety of specifications, including 25.4*350mm, 27.2*350mm, 28.6*350mm, 30.4*350mm, 30.8*350mm, 31.6*350mm, etc. It can be adapted to different types of mountain bikes to meet diverse usage needs. Whether you are a daily cycling enthusiast or a professional mountain bike rider, you can find a seat post specification suitable for your vehicle. C. This seat post has been carefully designed and undergone strict quality tests. It has good stability and comfort, bringing you a more pleasant riding experience. D. It is widely applicable to various riding scenarios. Whether on rough mountain roads or flat city streets, it performs well.