Self SealingPre-filled into inner tubes in the correct dosage* Prevents flat tyres* Seals punctures instantly up to 3mm diameter* Works time after time* Water based with anti corrosion - completely harmless* Inner tube and tyre will not stick together* Will not dry out regardless of outside temperature* Every inner tube is individually tested before leaving the factory.Schrader valve Sizes; 20 x 1.75. 12.5 x 1.75, 24 x 1.75, 26 x 1.75, 700c x 35. 29 x 2.1/2.35. 650B x 1.75/2.10.