Cannondale 12x1.2-2.3’’ Tube 70 degree 40mm Schrader ValveThe Cannondale 12x1.2-2.3’’ Tube 70 degree 40mm Schrader Valve is a durable butyl rubber. Designed to hold up in the most brutal conditions as you train or race. These tubes have a 0.9mm wall thickness and passes a 24-hour air hold test before packaging.884603924143