Dynaplug(R) 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. A repair can last the life of your tire if installed correctly. No Sealant required! Only for use with Dynaplug(R) Air, Racer, Megapill, Megaplugger and Micro Pro/Pill. Made in USA