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: 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- 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 and strong air tightness. meantimes, with thick rubber that absorbs shocks, you 't feel the bumps and hollows, add comfort to your ride. 4. MORE : Every tire produced has undergone quality inspection and is . For example, if a person weighs 190 pounds and the tires are not , he can travel more than 5000 miles. 5. These tube are Cheaper than buying in local 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: 4 x bike tube 4 x tire levers Only the above package content, other products are not included. Note: Light reflection 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.