The SIG Sauer MPX Magazine is a standard factory replacement magazine. This magazine is for MPX Generation II or KM models chambered in 9mm Luger and holds 10 rounds of ammunition. It is made of polymer and is made to SIG Sauer specifications and tolerances, using the same manufacturing and materials as the original equipment magazines, ensuring perfect fit and operation. Specifications: Manufacturer Number: MAG-MPX-9-10-KM SIG Sauer factory magazine Caliber: 9mm Luger Capacity: 10 Rounds Body Material: Polymer Spring Material: Steel Follower Material: Polymer Baseplate Material: Polymer Finish: Matte Black Fits: SIG Sauer MPX Generation II and KM models