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【Sizes】700C bike inner tubes 700 x 35C/43C compatible with 700X35-38-40-42-43C bicycle tyres. 【High Quality】The bike tube is made from premium butyl rubber. It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation. 【Important Note】When changing a bicycle inner tube, be sure to add a little air before installing it. This gives it form so it doesn't get twisted or bunch up which may cause a pinch flat. Inspect for an even bead of the tire to the rim on both sides. 【Comfortable & Safe】After replacing the butyl rubber bicycle tube, it absorbs the impact on the uneven road surface, making riding more comfortable and safe. 【To Friends】Dear friends, we have been focusing on bicycle accessories, and continue to adhere to, if you encounter any problems after purchase, please feel free to contact us, we will try our best to solve for you.