These are no ordinary bicycle tubes! Theseextra stronginner 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 sizeSeals multiple punctures repeatedly Non-toxic and non-flammable Cleans up with water Tube sizes and valve types available for nearly every type of bike. See the Sizes& Specs tab for size and valve details. Works in bicycles, wheelbarrows, wheelchairs, jogging strollers, snow blowers and much more.Stop flats for 2 years!