These are no ordinary bicycle tubes! These extra strong inner tubes stop flats for 2 years because there is Slime inside. Works in bicycles wheelbarrows wheelchairs jogging strollers snow blowers and much more.  No more flats for 2 years! Extra strong with Slime sealant inside Instantly seals tread area punctures up to 1/8″ 3mm in size Seals multiple punctures repeatedly 700 x 35-43mm Presta Presta valve stem Pre-filled with puncture stopping Slime tube sealant Non-toxic and non-flammable Cleans up with water  Prevents flats for 2 years!