Standard 100% Butyl Inner Tube — Center/Side Metal Valve (Threaded/Nuts)/TR-4 (round base)

"Real butyl tubes" made from 100% 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 100% butyl tube minimizes natural air leakage while maintaining air pressure for a longer period of time