ProMag Steel Pistol Magazine Ruger Security-9 9mm 32-Round Blue Black 32RD. 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. Specifications for ProMag Steel Ruger Security-9 9mm 32-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Ruger Security-9 Caliber: 9mm Luger Magazine Capacity: 32 Round Color: Black Fabric/Material: Steel Features of ProMag Steel Ruger Security-9 9mm 32-Round Pistol Magazine Magazine body constructed of heat treated steel with black oxide finish Injection molded magazine follower Magazine spring formed from heat treated chrome silicone wire Package Contents: ProMag Steel Ruger Security-9 9mm 32-Round Pistol Magazine What firearm models does the manufacturer say ProMag Steel Ruger Security-9 9mm 32-Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Steel Ruger Security-9 9mm 32-Round Pistol Magazine is compatible with Ruger Security-9ProMag RUG-A41-32RD: Steel Pistol Magazine Ruger Security-9 9mm 32-Round Blue Black