Coil formed tubes are made of a variety of materials, including polymers such as polypropylene, polyethylene and nylon, among others. The polymer pellets are mixed with a plasticizer—typically, dioctyl adipate (DOA)—and melted in an extruder. This mixture is forced through a mold die that forms it into a circular shape with a uniform wall thickness. The tube-shaped material is cooled and then ejected. The tubing is then cleaned and dried prior to being spooled for delivery to manufacturers of various end products including flexible housings for electronic equipment, automotive parts such as shock absorbers and fan belts, clothing items like leggings and tights, and medical devices such as syringes.