Marking your brass to keep track with how many times it has been fired or identify brass ownership when collected at the range. Armanov has designed stencils that are specially designed for use with the Armanov Ammo checker. Each stencil set comes with 1 color marker. You can use any permanent marker that only leaves thin layer if color and does not leave any coat of lacquer that may reduce firearm reliability. Brass stencils are made from stainless steel and are quick to assemble and easy to apply, the solvent resistant plates can be used again and again. Ammo Checker is not included and sold separately.