The 15-round magazine for the Hellcat features stainless steel construction for durability, numbered round count witness holes and a polymer follower. The magazine's extension gives you extra gripping area and has a pattern that matches the Adaptive Grip Texture of the Hellcat's frame. The 15-Round magazine measures only .28" taller than the 13-round extended magazine. Specifications and Features: Round: 15 Material: Steel/Polymer Firearm Model: HELLCAT, HELLCAT RDP Caliber: 9mm