ETS or Elite Tactical Systems makes lightweight and reliable polymer magazines for your favorite pistols. These S&W M&P mags are primarily made of a rugged polymer that has been tested to be resistant to cracking warping and the spring tension has been tested to stand up to a full stack of rounds for extended periods of time. Their baseplates are designed to be easily pulled out of pouches and pulled out of the weapon if necessary in addition their baseplates aid in simple disassembly for cleaning and maintenance. ETS mags will make an excellent addition to the factory magazines that came with your weapon they are affordable and feed and function reliably.