ProMag's S&W Bodyguard extended 15-rd magazine for .380ACP pistols is constructed from heat-treated blued- steel, with a follower, lock-plate, and base-plate. It's molded from a proprietary DuPont Zytel based black polymer.ProMag magazines are designed utilizing traditional stamping and welding of heat-treated high carbon steel. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Features: Magazine body constructed of heat treated carbon steel with black oxide finish Injection molded magazine follower Magazine spring formed from heat treated music wire Made in USA