Description Compatible with all full-size, compact, and sub-compact 9mm double-stack Glock handguns Durable, lightweight, and extremely stiff polymer construction High visibility controlled-tilt follower Long life stainless steel spring for corrosion resistance Flared, easily removable floor plate Dot matrix panel for magazine marking and identification Magazine indicator windows on both sides of body at 10, 15, and 21 rounds remaining Drops free loaded or unloaded