1. PRODUCT SPECIFICATION: The tube is suitable for most mountain bikes and is the most widely used size Currently on the market, compatible with 26 inches X 1.75 to 2.125 tires. At the same time, the inflation valve is adopted 32mm standard schrader valve. 2. REINFORCED VALVE DESIGN: We made a statistics before production. Among the cases of tube leaks and tears, 70% occurred at the interface between the valve stem and the tube. Therefore, we deliberately made a thickening treatment at the interface. So the inner tube of is a tear-resistant reinforced valve design. 3. THICKER RUBBER: The conventional tube sidewall thickness is 0.75~0.98MM, but our sidewall thickness is 1.12MM, which is thicker than the sidewall on the market, so it is more puncture resistant and strong air tightness. meantimes, with thick rubber that absorbs shocks, you won't feel the bumps and hollows, add comfort to your ride. 4. MORE DURABLE: Every tire produced has undergone strict quality inspection and is durable. For example, if a person weighs 190 pounds and the tires are not damaged, he can travel more than 5000 miles. 5. These tube are Cheaper than buying in local big box store, my limited experience is that tube replacement is simpler and easier than tube repair. So replace the tube, don't repair it. Material:rubber colour:black Package Contents: 2 * bike tube 2 * tire levers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.