ProMag magazines combine traditional craftsmanship with modern manufacturing techniques, incorporating heat-treated high carbon steel stamping and welding, as well as precision injection molding with Mil-Spec polymer compounds. Each ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Specifically engineered for use with Shadow Systems CR920 pistols chambered in 9mm, this ProMag drum magazine features a steel upper tower and a body constructed from proprietary DuPont Zytel polymer.