Dr Sludge "Self Healing" Inner Tube is suitable for most pushchairs, prams, strollers & buggies with 12.5 X 1.75-2.125 Tyres Dr Sludge Now pre-filled into inner tubes in the correct dosage Prevents flat tyres, Seals punctures instantly,Works time after time instantly seeks out and seals punctures as they occur Water based with anti corrosion - completely harmless Will not dry out regardless of outside temperature, Inner tube and tyre will not stick together - These tubes have straight valves

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