We trust Stan's No Tubes Tubeless Tire Sealant in our bike tires to seal up punctures and keep us out on the trails. This Stan's product features 12, two-ounce bottles of tubeless sealant, which is enough for 12 individual applications or six complete bikes. Each bottle is pre-measured and is the perfect amount of sealant for each tire. Stan's Tubeless Sealant lasts from two to seven months inside the tire and can work in temperatures as cold as negative 20 degrees. Stan's Tubeless Sealant can be injected through valves with the valve core removed for easy application, and the sealant itself is made of natural materials that are safe for the environment.