Made of high quality alloy material, lightweight, durable and long lasting. Frosted surface, pillar style design, exquisite workmanship, nice touch feeling. Easy to install and convenient to use. Help to raise height of saddle to ensure rider a comfortable riding experience Suitable for most MTB road bike, fixed gear bicycle, mountain bike, downhill bike, track bike and more. Specification: Material: Aluminum Alloy Color: Black Inner Diameter: 22.2mm/0.87inch Length: 250mm/9.84inch, 300mm/11.8inch, 350mm/13.78inch, 400mm/15.75inch(optional) Package Includes: 1 Piece Bike Seat Post Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.