Elite Tactical Systems Group OMEGA Magazine, 9MM, 30 Rounds, For Glock 17/18/19/19X/26/34/45, Hardened Steel Feedlips, Polymer, Clear OMG-GLK-18 ETS magazines are made from advanced polymers that provide extreme impact resistance so they won't crack or break when dropped. With superior temperature tolerances ETS magazines won't become brittle over time" even when exposed to harsh environments" chemicals" or extreme cold. The OMEGA line incorporates hardened steel feedlips and frame to provide seamless ammunition feeding.