Product name: bicycle double nail seat tube Material quality: aluminum alloy Color: colorful Specification: 27.2mmx400mm / 30.9mmx400mm / 31.6mmx400mm Weight: 27.2mm: net weight is about 281g, including packaging about 377g 30.9mm: net weight is about 300g, including packaging about 395g 31.6mm: Net weight is about 316g, including packaging about 409g Packing size: 433mm x 59mm x 59mm Warm reminder: Warm reminder: This seat tube is photographed due to the lighting of the shooting There may be discrepancies between the color of the photos and the color of the actual object, and everything is based on the actual object.