This is an original equipment manufacturer replacement or spare magazine for the AREX Rex Zero 1 Standard. It's constructed from steel alloy and holds 17 rounds of 9x19mm ammunition. When you choose OEM magazines, you can be assured of getting the same quality materials and attention to manufacturing as the magazines originally supplied with your firearm. If you need a spare magazine, you need this AREX Rex Zero 1 magazine. Specifications and Features: AREX M-REXZERO1-9-17 Factory Authentic Magazine 9mm Luger 17 Rounds Steel Alloy Polymer Baseplate Matte Black Finish Fits: AREX Rex Zero 1 Standard