These are no ordinary bicycle tubes! These extra strong inner tubes stop flats for 2 years because there is Slime inside. No more flats for 2 years! Extra strong because there s Slime inside. Instantly seals tread area punctures up to 1/8 (3mm) in size Seals multiple punctures repeatedly Non-toxic and non-flammable Cleans up with water Tube sizes and valve types available for nearly every type of bike. Works in bicycles wheelbarrows wheelchairs jogging strollers snow blowers and much more. Stop flats for 2 years!