ProMag magazine bodies are constructed of polymer for strength. The springs are precision wound using heat-treated chrome silicon wire. Bases and followers are injection molded from polymers selected for their durability. The result is quality, consistency, durability and reliability. This 50-round drum magazine fits SIG PRO 9mm pistols. The magazine body constructed of a proprietary DuPont Zytel™ based polymer, a blue steel upper magazine tower, with an injection molded magazine follower. The magazine spring formed from heat treated stainless steel, and everything is made in USA.

Specifications: Caliber: 9mm, Capacity: 50 Rounds, Body Material: Polymer, Color: Black

This is for (1) one 50 round drum magazine for 9mm caliber SIG PRO model pistols.