Dynaplug® tubeless tire repair plugs are constructed from viscoelastic rubber impregnated cord and non-abrasive brass tip. The plugs are specially designed to be inserted directly into a puncture after object has been removed. A repair can last the life of your tire if installed correctly. For use with all Dynaplug® tubeless tire repair tools. What's in the box: 5 Tubeless tire repair plugs WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov This warning is being provided to comply with the State of California's Proposition 65.