First choice of riders around the world for tubeless conversion and flat prevention Seals punctures up to 1/4" (6.5mm) quickly Stays liquid 2-7 months for long-lasting protection Premium low-viscosity formula resists freezing to work in environments as cold as -30Adeg F (-34Adeg C) Natural materials, safe for the environment Can be injected through valve stems with removable cores compatible with tubes and tubular tires The Product that Started a Tubeless Revolution. Inside this simple black bottle is a product that changed cycling. Today&';s tubeless systems rely on the lighter, more reliable, self-sealing performance of Stan&';s Tire Sealant. The #1 Rated Tire Sealant on the Market Just two ounces of Stan&';s in a converted standard tire or tubeless tire can repair punctures up to 1/4" almost instantly to keep you rolling. Longer-lasting Stan&';s Tire Sealant is formulated to stay liquid in tires with even thin casings for up to seven months. Arid conditions require more frequent monitoring of sealant levels, but anti-freezing agents in our special formula allow Stan&';s Tire Sealant to be used in temperatures as cold as -30Adeg F. One quart will convert up to 16 tires.