High-Quality Inner Tubes for All-Season Use It all starts with high-quality rubber. Made from high-quality, durable, and weatherproof butyl rubber, these inner tubes are thick yet stretchable to accommodate tires that are up to 25mm in width. The tubes can withstand high PSIs and remain airtight, removing the need for constant reinflation. More important than its thickness, each inner tube is evenly molded, ensuring that are no thin spots that will weaken the inner tube as it expands. Ride on bumpy or rocky trails in any type of weather. The inner tubes' weatherproof and evenly-molded butyl rubber compound can withstand both warm and cold weather without deteriorating or losing structural integrity. And there's no need to worry about storing these inner tubes for an extended amount of time. You can store these road bike tubes for years! Dependable 60mm Presta Valve Stems Presta valves offer both convenience and security. Specifically designed for high-performance tires and wheels, these valves are thinner and lighter. Its thin frame only requires a small hole in the road bike's rim, improving the rim's strength and performance. As a standard centered valve, the valve stem seats securely on the walls of the inner tubes, preventing leaks from the valve junction. Also, valve's 60mm (2.36 inches) length makes on-the-spot inflation a breeze, especially on deep-section rims. The brass reinforcement on the valve stem's body also makes the valve more rigid and secure, especially as you'll need to screw and unscrew a small part, the valve nut to open and close the valve during inflation. Air loss is minimal with the valve stem caps providing additional protection not only from leaks but also from debris. 700x20c Road Bike Tubes Super Value Pack AR-PRO provides the balance of quality and affordability. There's no compromise, just cost-effective options for those who are always out on the road or trail or even for casual riders. This super-value pack includes 6 inner