Built from heat-treated steel with an anti-fatigue internal spring and ultra-durable DuPont® Zytel™ polymer baseplate, the ProMag® 910, 915, 459, 5900 Series 9mm 15-Round Blue Steel Magazine is an affordable centerfire pistol magazine, designed to deliver smooth, factory-like field performance with your Smith & Wesson 910, 915, 459, and 5900 Series pistol – without breaking the bank. The heat-treated steel body features a corrosion-resistant blued finish for lasting durability, while the heat-treated chrome silicon wire internal spring eliminates binding, ensuring the injection-molded polymer follower operates flawlessly for reliable feeding. If that’s not enough, this magazine is backed by ProMag’s legendary lifetime warranty for lasting service and consistent field performance you can depend on! Order today. Made in USA.