ProMag CZ Scorpion 9mm 50 Round Drum Magazine. This high capacity drum mag features a durable, steel lined DuPont Zytel polymer body with an over molded, heat treated carbon steel reinforced feed lips for lasting performance and durability in extreme conditions. Plus, a heat treated chrome silicon wire internal spring eliminates binding, ensuring the injection molded polymer follower operates flawlessly for reliable, jam free operation.Features :DuPont Zytel Polymer ConstructionHeat treated Stainless Steel Internal SpringInjection Molded Polymer FollowerAggressive Texturing for Positive Grip50 Round Drum MagazineFlat Dark Earth