Promag Glock 17/19/26 9mm Luger Handgun Magazine - 18 Rounds - The magazine body is constructed of a proprietary DuPont Zytel based polymer. It has full length steel internal insert stamped and welded like the factory magazine. 18-Round Magazine Fits Glock Model 17, 19, And 26 9mm Luger Injection Molded Magazine Follower Spring Is Made From Heat Treated Chrome-Silicon Wire Made In USA