2 Pack 20x3 Fat Tire Bike Inner Tubes, 20 x 3.0 Durable Butyl Rubber Inner Tube with Schrader Valve for 20 inch Electric Bicycle2 Pack 20" x 3.0 Fat Tire Bike Inner Tubes with standard schrader valve. Our tubes are made of high quality butyl rubber, which has better air tightness, more durability, and better sealing performance. It is ideal for rep..