Make of plastic, it have good wear resistance and durability, and can effectively resist the puncture and air leakage of external objects, maintaining a good inflation condition We offer 3 different lengths of nozzles: 45mm, 65mm, and 85mm, which is suitable for most wheel rims height. You can choose the appropriate inner tube according to the needs of the bicycles Specially designs for road bicycles, it perfectly matchs wheel size to ensuring a stable Cycling experience Suitable for professional bicycles maintenance personnel and bicycles enthusiasts, it can used as accessory to replace or repair the inner tube of road bicycles The inner tube adopts a Light Weight design, reducing the weight of the entire vehicle and improving the flexibility and speed of cycling