This is an Elite Tactical Systems CLEAR 9-round magazine for Glock 27 pistols in .40 S&W

Elite Tactical Systems (ETS) makes durable, affordable magazines for Glock pistols which are immediately recognizable by their signature translucent body.  This distinctive feature enables you to see ammo level at a glance without peering at witness holes that may not even cover the full capacity of the magazine.

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 durable construction of ETS magazines eliminates creep and bulging, so the feed lips and body won’t spread when being stored long term, even when fully loaded.

Rotating your loaded magazines periodically reduces wear and tear.  Pick up some of these affordable Glock 27 flush-fit magazines from ETS today and give your factory magazines a rest!