Marathon Smart Tube features advanced Fibro-Seal technology that effectively prevents flat tires by sealing punctures up to 1/8 inch. This innovative tube is designed with a tire width of 4.80 inches, a tire sidewall height of 4 inches, and fits wheels with an 8-inch diameter. It comes packaged with one tube and is engineered to provide reliable performance and durability for your tire needs. Model Number: 45012