Give your bike a little extra protection against punctures with the Schwinn Self-Sealing Bike Tube. Filled with a self-sealing gel that seals small holes quickly, this bicycle inner tube protects against flats for up to 2 years. This Schwinn tube is made from durable rubber and boasts a standard Schrader valve for easy inflation.. Features Durable rubber construction; Filled with a gel that quickly seals small holes; Protects against punctures for up to 2 years; Standard Schrader valve for easy inflation; Specifications Size: 20"; Color: Black; Gender: Unisex; Length (in.): 5.7; Width (in.): 1.9; Height (in.): 8.32; Weight: 3.1 lbs; .