Joe's No Flats: Fiber gel sealant for tubes, perfect for city, commute and E-BikesSuitable for tubes only.Contains micro-fibers to prevent punctures in the tread of up to 3 mm.Unmatched longevity - lasts up to 3 years in the tube.Long shelf life- up to 3 years.Non-toxic, long lasting and easy to install.Easy to use spout fits into all valves.CO2 compatible.For effective puncture resistance, add fresh sealant every 12 months.If you get a puncture, always SPIN the wheel to disperse the sealant.