One of the most difficult tasks to complete with CERAKOTE is color filling inside engraved or etched surfaces. The CERAKOTE Painting & Color Fill pen was designed as a gravity fed, drip type applicator to help fill in the smallest and most shallow of engravings. If you only need a drop of coating, no problem! This pen will be a useful tool to help bring your project some much needed contrast! Features: Fine line - .5mm All metal Protective cap Included cleaning tool