Some of the most popular magazines used today are the Glock-pattern mags developed initially for the Glock®G17 and compatible with some of the most popular 9mm Glock®handguns on the market, including the G19 and the G26. These aftermarket Glock®17/19/26 polymer magazines bring enhanced capacity to these pistol platforms, as well as all of the other Glock®magazine-compatible carbines and handguns available today. Each Glock®17/19/26 polymer magazine is built for use with the 9mm cartridge, and the magazine body is constructed using DuPont's proprietary Zytel polymer, which has been proven to be durable and long-lasting. Constant spring pressure is provided by a heat-treated chrome-silicon wire spring. The magazine are all made in the USA and feature an all-black finish.