Compatible Firearms: WITNESS / TANFOGLIO SMALL FRAME PISTOLS Caliber: 9mm Capacity: 17 rounds (+1 round compared to factory magazines and still flush fit) Coating: Anti-Friction Follower: High-impact polymer Tube: Heat treated carbon steel Spring: High tensile music wire Floorplate: High-impact polymer that sits flush with the pistol Anti-Friction coating allows for easy loading, reduced malfunctions, and Superior anti-corrosion properties If you are looking for a magazine for your WITNESS / TANFOGLIO pistol, choose the magazine manufacturer that is the most trusted in the industry. All Mec-Gar magazines are made in Italy with the most sophisticated technologies and best materials.