Cannondale 27.5x2.0-2.5’’ Tube 48mm Presta ValveThe Cannondale 27.5x2.0-2.5’’ Tube 48mm Presta 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.884603924891