High quality inner tubes filled with our inner tube sealant in the correct dosage. In the event of a puncture, the solution is forced to the hole by centrifugal force, while the fibres plug the hole immediately and permanently with minimal loss of pressure. Prevents flat tyres, seals punctures instantly up to 3mm diameter, and works time after time. The water-based formula is harmless, anti-corrosive, and will not dry out regardless of outside temperatures.