Upgrade from an inner tube to a smart tube and enjoy two years of flat tire protection. Smart tube an inner tube with Slime inside. Seeks out and seals punctures up to 1/8 inch, 16 inch. Installs just like a regular tubeRepeatedly seals when puncturedSchrader valveFits tire sizes 16 x 6.5-8 inch and 16 x 7.5-8 inchSlime inner tubes come preinstalled with Slime tube sealant