MTM Rifle & Pistol Chamber Safety Indicator Flag 8-Pack (Yellow) MTM Chamber Indicator Flags are made of rugged polypropylene right here in the U.S.A. Brightly colored for easy recognition of an empty firearm chamber. Sold as an 8-pack, includes four pistol flags and four rifle flags. - For semi-auto and bolt action firearms - Made of long-lasting polypropylene - Long enough to extend well into the bore for added safety - 8-pack: 4 pistol and 4 rifle - Made in the USA