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[Size] AV34mm (conventional valve). Suitable for 26 "x 4.0/4.5" thick inner tube [Installation precautions] Please check the side of the tire to understand the tire size used by the bicycle [High quality] The bicycle inner tube is made of high-quality butyl rubber. It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation, etc. [Easy to install] The installation is fast and convenient. When the tire leaks completely, follow the inflation guidelines. Save time and energy, and replace the old pipe in a few minutes. [Important] When replacing the inner tube of a bicycle, add a little air before installation. This forms its shape, so it does not twist or pile up, which may cause flattening. Check whether the tyre bead of the rims on both sides is even. [Comfort and safety] After the butyl rubber tube is replaced, it absorbs the impact on uneven roads, making riding more comfortable and safe.