Made of light and strong 6061 aluminium alloy, anti-oxidation, and good load bearing.<br> Fine workmanship, surface matte process.<br> Suitable for most road bike, fixed gear bicycle, mountain bikes, MTB, et.<br> Multiple size options (depending on your car model).<br> Specification:<br> Meterial: 6061 Aluminium Alloy<br> Color: Black, Silver<br> Size Chart:<br> Length: Approx. 300mm/11.8inch 400mm/15.75inch 450mm/17.7inch<br> Diameter: 27.2mm/1.07inch<br> Head Diameter: 22.2mm/0.87inch<br> Package Includes:<br> 1 Piece Bicycle Seatpost<br> Note:<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> Due to manual measurement, there may be 1-2mm error in size.<br> Note: 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. Sold by-YJL official store