[SIZE] 32mm (Regular valves). Fits all 20inch x 3.0inch tires & tubes [Installation Precautions] Check the side of your tire for the tire size your bike uses [MORE DURABLE] The bike tube is made from premium butyl rubber. It features better sealing performance, resistance, anti-aging, shock absorption, and electrical insulation properties [Easy To Install] Installation is quick and easy. Guide when airing a tire from a complete flat. Hassle-free to replace your old tire tubes within minutes, which is time-saving and efficient [Safe Bike Tires] The butyl rubber tire tube replacement absorbs shocks on bumpy roads for comfort and safety. It is heat resistant and withstands wear and tear for daily use Colour: Black Material: Butyl rubber Package Contents: 2 x 20 inch bike tubes Only the above package content, other products are not included Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm