"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 body { font-family: Arial, sans-serif; } .specs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 800px; margin: 0 auto; } .spec-item { display: flex; flex-direction: column; padding: 5px; } .spec-item .name { font-weight: bold; color: #666; } .spec-item .value { color: #333; } Brand PARTS UNLIMITED Vendor Part Number B20024 Duty Standard Inner Tube Valve Stem Type TR-4 (Round Base), Center Metal Valve (Threaded/Nuts) Material Butyl Polymer Mounting Position Front/Rear Product Name Inner Tube Rim Diameter 15" Tube Fits Tire Size 130/90-15, 140/80-15 Tube Thickness 2.0 mm Type Motorcycle Units Each