The Mec-Gar Beretta 84 Cheetah .380 ACP 13rd Blued Magazine is a standard capacity 13 round .380 caliber magazine. The carbon steel tube is heat treated for strength. This magazine features a high tensile music wire spring. It also features a polymer follower and butt-plate. Caliber: .380 ACP Carbon steel tube, heat-treated for strength High tensile music wire spring Polymer follower and butt-plate 13 round capacity