Brand NEW BWSHLF Bicycle Inner Tube 700x18-25/25-32/35-45 Road Bike Replacement Inner Tubes with 48mm 60mm Presta Valve 6 Pack Different from ordinary inner tubes, these use 60% high butyl rubber. The air tightness of this high-quality rubber is 8 times that of natural rubber, and it is not easy to break due to temperature changes. The sidewall thickness is thicker, the allowable inflatable section is more elastic and resistant to puncture. 6 packs, 700X18/25C F/V-48 fits 700c road bikes that are between 18 to 25 wide ? 48mm Presta Valve; 700x25/32C F/V-60( 25 to 32 wide ? 60 mm Presta Valve); 700X35/45C F/V -48 (35 to 45 wide ? 48mm Presta Valve). Each of these inner tubes have passed a strict 100% quality control inspection. And all tubes are round cured to ensure uniform roundness and better reliability. After explosion-proof and inflation tests, the quality control can give you 100% peace of mind. Simple and quick installation process. Hassle-free to replace your old tire tubes within minutes which is time saving and efficient. It can also be done easily by novices, especially suitable for cycling enthusiasts who are often troubled by changing inner tubes. See pictures for more item details. Trusted Seller-Fast Ship!