Features： 1、Aluminum alloy tube has the high‑grade light weight, performance and strength. 2、High strength full metal head , suitable for road and mountain bikes. 3、The bicycle seat post has an exquisite workmanship, bolt design offers easy infinite angle adjustment. 4、With four specifications are 27.2 x 450mm/ 28.6 x 450mm/ 30.8 x 450mm/ 31.6 x 450mm, to meet your all bicycles. 5、Ideal for cycling enthusiasts and collectors and it will work. Specification： Features: Aluminum alloy tube has the high‑grade light weight, performance and strength. High strength full metal head, suitable for road and mountain bikes. The bicycle seat post has an exquisite workmanship, bolt design offers easy infinite angle adjustment. With four specifications are 27.2 x 450mm/ 28.6 x 450mm/ 30.8 x 450mm/ 31.6 x 450mm, to meet your all bicycles. Ideal for cycling enthusiasts and collectors and it will work.   Specifications: Brand: MEIJUN Condition: Material: 6061 Aluminum Alloy Color: Black Size: 27.2 x 450mm Weight: Approx. 387-431 g Package List: 1 x Seatpost Note: Please note that the 0-12 scale and 0-15 scale will be sent randomly, and  make sure you will not mind before ordering. Package List：