ProMag Steel Pistol Magazine Kel-Tec P-11 9mm 20-Round Black 20RD. 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 Kel-Tec P-11 9mm 20-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Kel-Tec P-11 Caliber: 9mm Luger Magazine Capacity: 20 Round Fabric/Material: Polymer Features of ProMag Steel Kel-Tec P-11 9mm 20-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 Kel-Tec P-11 9mm 20-Round Pistol Magazine What firearm models does the manufacturer say ProMag Steel Kel-Tec P-11 9mm 20-Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Steel Kel-Tec P-11 9mm 20-Round Pistol Magazine is compatible with Kel-Tec P-11ProMag KEL-A2-20RD: Steel Pistol Magazine Kel-Tec P-11 9mm 20-Round Black