Enhanced PARTS UNLIMITED Inner Tube - Standard - 21 - TR-4 - Center Metal Valve B20077 Stylish

Inner Tube - Standard - 21" - TR-4 - Center Metal Valve " butyl tubes" made from butyl polymer, unlike other "butyl" tubes, which are blended with butyl polymer and natural rubber, Each tube is individually boxed with a full range of sizes and valve stem types clearly marked on each box end, butyl tube minimizes natural air leakage while maintaining air pressure for a longer period of time