These E-Lander 8 Round 1911 45 ACP Steel Magazine With Straight Polymer Floor Plate are made of heavy gauge steel. The 8 round 1911 magazines feature a well designed steel anti-tilt follower to ensure proper feeding of ammo into your firearm. These also feature an improved and reinforced polymer floor plate to ensure that the spring and steel follower are secure and tight. They are designed for use in any condition due to being coated in a Black Oxide finish that can withstand up to 96 hours of continuous salt spray and still function perfectly. Straight floor plate sits flush with magazine well.