Feature: 1. Using butyl rubber material, it has excellent air tightness, good resistance to cold and heat, and aging resistance. 2. The butyl rubber tire inner tube can absorb the vibration of uneven roads, thus ensuring comfortable and safe driving. 3. Simple installation, and the old tire inner tube can be easily replaced within a few minutes, which is time‑saving and efficient. 4. Equipped with a Schrader valve, it widly fit 12 1/2x1.95x2 1/4inch folding bike tires. 5. It will never let your folding bike go flat with a replacement bike inner tube tire on hand. Specification: Item Type: Folding Bike Inner Tubes Material: Butyl Rubber Product Color: As Pictures Shown Product Weight: Approx. 113g / 4.0oz Gas Nozzle Type: Schrader Valve. Package List: 1 x Folding Bike Inner Tubes Note: Remember not to run out of gas. When the tire is accidentally punctured during use, just use a fine‑toothed file to lightly roughen the surface and apply ordinary tire repair glue. After it is dry, stick the small rubber skin on.