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.Presta valve Sizes; 26 x 1.75, 700c x 35.