BWSHLF 27.5" Mountain Bike Inner Tubes (2 Pack), Durable Butyl Rubber MTB Bicycle Replacement Fit 2.1-2.4, Presta Valve 48mm

High-Quality Rubber Material: Different from ordinary inner tubes, we 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 conventional sidewall thickness is 0.8~0.95 millimeter, but our sidewall thickness is 1.1~1.2millimeter, which is thicker than the sidewall on the market and is more puncture resistant. Various Sizes: 27.5x2.1-2.4; F/V Presta Valve 48 millimeter; 27.5 means our bike tubes fit 27.5 wheel (pls kindly confirm that your bike tire is suitable before you buy), width between 2.1-2.4 inch tire. 48millimeter presta valve suitable for most mtb inner tubes. Vulcanized Tubes: Each of our 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, our quality control can give you 100% peace of mind. Design: The exquisite carton contains two inner tubes for easy replacement and storage. Please note: All inner tubes need to be put into the outer tire before inflating, so that the outer tire will protect the inner tire from exploding. If you have any questions, please do not hesitate to contact us. BWSHLF will provide you with the most satisfactory solution