1. Size: 32mm AV (Regular valves). Fits all 26" x 2.5/3.0" tire tubes. compatible with Road bike /Mountain bike Tire ( ETRTO : 64-559/76-559 ) bicycle tire tubes. 2. : The bike tube is made from butyl rubber.It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation. 3. : Installation is quick and easy. Please follow inflation guide when airing a tire from a complete flat. Save time and effort, replace the old tube in a few minutes. 4. 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. 5. Comfortable and Safe: After replacing the butyl rubber tube, it absorbs the impact on the uneven road surface, making riding more comfortable and . 6. Installation Precautions: Please check the side of your tire for the tire size your bike uses