Featuring a heat-treated carbon steel magazine body with impact-resistant Zytel™ polymer baseplates and followers, the ProMag® P99/SW99 9mm 15-Round Blue Steel Magazine is a performance-enhanced centerfire pistol magazine, engineered to deliver factory-like performance at a budget-friendly price. This pistol mag comes equipped with an impact-resistant, flush-fit polymer floor plate for long-lasting durability, corrosion resistance, and snag-free performance, while the injection-molded polymer follower and steel wire spring work together to ensure smooth, reliable feeding in any environment. Plus, numbered witness holes deliver quick round counts at a glance for added reliability while on the move. Order yours today!