The ProMag Glock 17, 19, and 26 9mm 32 Round Magazine fits Glock Models 17, 19, and 26 9mm pistols. The magazine body is constructed of a proprietary DuPont Zytel based polymer and has a full length steel internal insert stamped and welded like the factory magazine. It also features an injection molded magazine follower. The spring is made from heat treated chrome silicon wire and is made in the USA.