"Give your bike a little extra protection against punctures with the Schwinn 27.5"" 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. The Schwinn 27.5"" Self-Sealing Bike Tube fits 27.5"" tires between 1.75"" and 2.125"" wide.Manufacturer model #: SW79168A. 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"