The 20" Heavy Duty Fat E-Bike Tires 20x4.0 with Tubes is a set of four puncture-resistant and foldable tires designed for all-terrain use. Made of durable rubber with a tensile strength of 30.0, these directional tread tires are suitable for E-Bikes and Fat Bikes. The set includes two tires and two tubes, with a weight of 12.52 pounds per tire. With a warranty of one month and a brand name of UGNE, these heavy-duty tires offer reliability and performance for your cycling adventures.