High air-tightness, high abrasion resistance, high resistance to aging,Lower prices Accept OEMRun Star butyl tube characteristics:High amount of butyl rubber, low price, high air tightness, high abrasion resistance, high resistance to aging,heat-resistant, coldRun Star butyl inner tube test data:Tensile strength ≥ 12.5MPa Elongation ≥ 590% Bicycle inner tube 40-635high quality various sizes ...