Ets Glock .40 Cal. Mag Inserts Rrs- Yellow Fits Glock .40 Cal. 2 Pack GLK40-RRS-YL

The ETS Rapid Recognition System allows you to quickly and easily differentiate your mags. Many people mark their mags to identify what kind of load, or even what caliber so you don't accidentally run the wrong ammo in your Glock. And since the mags are Translucent you can see your color from any angle with a quick glance!