Elite Tactical Systems Group Magazine, 9MM, 40 Rounds, Fits Glock 17/19/19X/26/34/45, Clear GLK-18-40 Extreme Impact Resistance-won't crack or break when dropped. Very resistant to harsh chemicals. Superior heat" cold and UV resistance-won't become brittle over time even when exposed to harsh environments or extreme cold. Translucent body-allowing you to see your ammo count and type. Creep resistant-the feed lips and body won't spread when being stored long term even when fully loaded