After Market Clone of the Original Glock 17 Factory Magazine, 17 Round capacity. Fits Flush in all Glock 17 pistols and extends out of mag well slightly on other 9mm models. Black Polymer with Steel Reinforcement Inserts and Loaded Round Indicators Just Like the original. We have tested extensively and they work great...Mfg Warranty.Polymer mag body lined with a steel sheath and steel reinforced feed lips. These look and work great. Has remaining round count window up back of mag just like the original.