An aiframe introduced by Public Missiles: These tubes are made in the USA from a special blended polymer that is extremely durable and easy to use. Most epoxies and paints will readily adhere to this material. It has been tested and found compatible with the following paints: lacquer, enamel, epoxy and urethane, as well as many different primers. The Quantum Tube can be squeezed, dropped, or even thrown and will not suffer any damage as can sometimes occur to cardboard or phenolic tube. The Quantum Tubes are molded in medium gray and have a glass smooth finish. The Quantum Tube does have one thing missing: the spiral groove!