Description: Merit of excellent shock resistance, which it has good use feeling. And it has delicate appearance and good stability because its high hardness and smooth line design. Using carbon fiber tube body, our bicycle seat tube is sturdy and reliable, and at the same time has strong corrosion resistance, so it has a long service life. It is made from carbon fiber and aluminium, is durable to use. There are two sizes of the product to choose from. Applicable to road bikes, mountain bikes, folding bikes, etc. Item Name: Bike Seat Tube Material: Aluminium,Carbon Fiber Features: Anti-rust, Smooth Surface, Perfectly Fitment Color: Black How to choose the size: 1. Check the diameter of the original seatpost and choose the same size as the original diameter. 2. Measure the inner diameter of the frame tube Size Details: Length: 350mm/13.78" (Approx.) Length: 400mm/15.75" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bike Seat Tube