This extended 10-rd magazine for your Bersa 383A series, 95 Thunder, 380 Firestorm, or 380 pistol is constructed from heat-treated blued-steel. Included is a follower, lock-plate, and base-plate molded from a proprietary DuPont Zytel based black polymer. It uses a spring wound from chrome-silicon wire and heat-treated for strength and reliability.