This is a high-quality butyl rubber bicycle inner tube designed for road cycling. It is available in various valve lengths and is compatible with American and French valves. The tube has a thickness of 0.87 mm and comes with an instruction sheet and color box packaging. Please note that the inflation of the inner tube alone will be greater than that of the outer tube, which may affect its service life. It is also important to remember that the inner tube can only be filled in the outer tube, which is the correct way to use it.