Bell 20 In. Self-Sealing Bicycle Tube is designed to keep you riding without interruptions from flats. This innovative tube features a sealant inside that instantly seals most holes up to 1/8" as you ride, providing reliable protection throughout the life of your tire. The tube sealant is specially formulated to resist zing and drying out, ensuring long-lasting performance. Made from durable butyl rubber, it fits tire widths from 1.75" to 2.125" and is compatible with 20" tire diameters. Packaged conveniently in a box, this self-sealing tube is an excellent choice for maintaining a smooth and worry- cycling experience. Model Number: 7064242