Markers meet the requirements of the ASME (ANSI) A13.1 - 2007 Standard for the identification of piping system contents when used with Directional Flow Arrow Tape. Markers are made of durable vinyl that is ideal for indoor and outdoor environments and are supplied on a coated backing material that makes handling and installation easy. Marker ends should be banded with Brady Directional Flow Arrow tape to indicate pipe content flow direction. One 2 1/4" H x 14" W marker per card.