Our beloved self-sealing tubes, only thicker and stronger. Gain extra protection against punctures and ride protected for up to 2 years with Slime's super thick self-sealing tubes. - Heavy-duty tubes! - Seals multiple punctures repeatedly for up to 2 years - Seals tread area punctures up to 1/8? (3mm) in size - Non-toxic and non-flammable - Cleans up with water - 32mm Schrader valve stem - Thicker and stronger tube for extra flat tire protection - Pre-filled with puncture stopping Slime tube sealant - Prevents flats for 2 years!