GLOCK OEM Magazine, 9MM, 10 Rounds, Fits GLOCK 17 & 34, Cardboard Style Packaging, Polymer, Black, Orange Follower, Gen5 47290 Each GLOCK magazine is constructed from a hardened steel insert encased in high tech polymer to protect the magazine and prevent deformation" even when dropped from a great height. The high quality spring and follower ensure reliable feeding from the first to the last shot.