Schwalbe doc blue tubeless sealant 500mlthink of schwalbes doc blue tubeless sealant as a liquid patch it gets to work quickly and reliably sealing puncture holes in tubeless tubed and tubular setups for tyres up to 56mm width one 60ml dose of schwalbes doc blue tubeless sealant will deliver effective puncture protection for approximately three months for larger tyres those 57mm and above width simply increase the dosage for effective protection featuresdose approximately 60m