Fine workmanship and perfect style. Easy to install and durable in use. Made of aluminum alloy, the metal strength is higher, durable and safe, so as to protect your riding. The angle can be adjusted by double nails and double tracks, and the angle of the cushion can be adjusted according to your own needs, so as to improve the riding comfort. Safety line, the product marks the safety line, which adds protection for your riding. Please do not lower than the marked range of the safety line when installing. Name: Mountainous Road Bicycle Tube Type: mountain bike post Applicable: mountain bike/bicycle accessories Style: A: 27.2 x 400mm Weight: about 300g color:Blue Material:aluminum alloy Package Contents: 1 x tube 1 x upper clamping piece 1 x lower clamping piece 2 x nuts 2 x screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.