A lightweight and solid tube that provides optimal performance is resistant to frost and overheating. Features: The tube is made of synthetic butyl rubber with a wall thickness of 0.90mm. The material provides excellent tensile flexibility to perfectly match the shape of the casing. The density of the material in turn provides excellent resistance to air leakage. The valve is made of high quality materials that extend the life of the tube. Size: 20x1,5/2,20. AV valve with length 33mm. Weight: 158g.