12 Pack Subsonic Magazine Marking Bands Holster Pouch Subsonic Ammunition Caliber Identification (Army Green-White)SUBSONIC on both side of the bands, ID the SUBSONIC magazines, designed to compliment our . 300 Blackout mag bands or other calibers where subsonic ammunition is in use, help to quick find the right mags, never pick up wrong mags again. Made of thick silicone rubber,strong, flexible and stretchy,with clear text printing and no fading,tight fit on your magazines. Fits AR 15 sized metal and polymer mags,also fits around many hand guards for quick gun