This 31 round Glock 9MM magazine from Elite Tactical Systems or ETS is made of translucent polymer. This advanced polymer is impact and chemical resistant, also holds up well to heat, cold and UV rays allowing it to not become brittle or yellow over time. The translucent body allows the shooter to see round count and ammo type. This magazine is also compatible with aftermarket floorplates and is easy to disassemble. Fits Glock GEN one through four models 17, 18, 19, 26, and 34. Holds thirty one rounds of your favorite range or carry ammo.