No flats yellow gel tyre sealant fiber gel sealant for inner tubes not for tubeless system contains micro fibers to prevent punctures in the tread up to 3 mm non toxic long lasting and easy to install easy to use spout fits into all valves for effective puncture resistance add fresh sealant every 12 months if you get a puncture always spin the wheel to distribute the sealant recommended amount for 1 26 or 29 inner tube a 240 ml bottle is good for 2 bicycle wheels buy no flats whee