Notubes race tyre sealant first choice of riders around the world for tubeless conversion and flat prevention twice the amount of our standard sealing crystals xl crystals capable of sealing even larger punctures stays liquid 2 7 months for long lasting protection premium low viscosity formula resists freezing to work in environments as cold as 30 f 34 c natural materials safe for the environment the next level in sealing power from the people who invented tubeless conversions if youve wal