7075 and 7050 aluminum for the structural parts. Self-bleeding cartridge that removes air from the fluid chamber with every actuation. Short insertion length is vital for smaller bikes, frames with curved seat tubes, and frames with seat tubes that have bottle bosses.Spacers for travel adjustment available individually or as kits. Please check all specifics above, especially on Forks, Wheels, and Tires. Axle, steer tubes, and other specifics may vary. PLEASE NO PO BOX's. Shop Info and Return Address. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Seatposts". The seller is "bicycle_addiction" and is located in this country: US. This item can be shipped to United States.