slime self sealing anti puncture inner tube 27 5 inch sv 1The Slime self sealing inner tube is the ideal solution for cyclists who don't want to worry about flat tires. This inner tube contains a small amount of Slime, a special gel. If a puncture develops in the tire, up to 3 mm in size, it's automatically filled with rubber particles. This allows you to keep cycling without interruption! Self sealing inner tube Holes up to 3 mm are automatically filled Non toxic and non flammable Works up to 2 years