Simply snap these markers in place without tape or adhesive. Open the coiled marker, suspend it around the pipe or conduit, and release to watch it snap into place. The Setmark ANSI-standardized identification markers are designed for indoor or outdoor use with dirty, oily, greasy, and rough surfaces. Each marker includes directional arrows that indicate flow direction and meet the ANSI/ASME A13.1-2015 standard. Ideal for electrical, fire protection, plumbing, and much more.