SIZE: 32mm Schrader (Regular valves). Fits 20" x 2.125", 20"x2.20", 20"x2.25", 20"x2.30", 20"x2.35", 20"x2.40'' tire tubes. High Quality: The 20inch bike tube is made from premium butyl rubber.It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation. Easy Installation: 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. 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 and Safe: After replacing the butyl rubber tube, it absorbs the impact on the uneven road surface, making riding more comfortable and safe. Package Includes: 2-pcs 20x2.125/2.40 AV32mm Schrader Valve bike tubes.