The ProMag® Smith & Wesson® Model 5900 Series Full Size 9mm 10-Round Magazine is an affordable aftermarket pistol magazine, engineered to deliver factory-like field performance at a low, budget-friendly price anyone can afford. This centerfire pistol magazine features a corrosion-resistant blued steel body for superior durability and lasting reliability in harsh field environments, while the heat-treated chrome silicon wire spring and injection-molded polymer follower ensure smooth, reliable operation for jam-free performance. Numbered witness holes allow for visual round counts for improved reliability and speedy ammo verification, and the removable polymer floor plate allows for quick disassembly when maintenance and cleaning are required. Better yet, this American-made pistol magazine is backed by ProMag's lifetime warranty for lasting service you can depend on. Made in USA.