Made of high quality aluminum alloy material, lightweight, durable and strong.Frosted surface, classic pillar style design, exquisite workmanship, nice touch feeling.Multi Sizes for different needs(33.9/34.9mmx 350/450/550mm)Suitable for most old style bicycle saddles with clamp.Please make sure above the minimum safety line when installingDesigned for folding bikesSpecification:Material: Aluminum AlloyColor: BlackInner Diameter: 33.9mm/0.87inch; 34.9mm/1.37 inchLength: 350mm/13.78inch, 450mm/17.7 inch, 550mm/21.6inch (optional)Package Includes:1 Piece Bike Seat PostNote:Color might be slightly different due to the color calibration of each individual monitor.Please allow slightly measuring deviation due to manual measurement.