12" Stroller/Pram Inner Tube - 12 1/2" (12.5") x 1.75 to 2 1/4" (Fits all 12" x 1.75, 1.85, 1.90, 1.95, 2.0, 2.1, 2.125, 2.25) - Universal Schrader/Auto Valve - FREE SHIPPING! 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.