700 x 38c Cycle Inner Tube (Fits all sizes 700 x 38 - 43) - Universal Schrader/Auto Valve! FREE VALVE CAP UPGRADE WORTH $4.99! SUPER AIR TIGHT - Less re-inflating required compared to other tubes. PUNCTURE RESISTANCE - Higher quality butyl rubber gives better protection. METAL VALVE CAPS - 3x Higher air retention than plastic caps.