BradySnap-On™ and Strap-On Vinyl Pipe Markers are designed for indoor and outdoor use and to deliver long life performance, especially in plants with minimal heat and chemical exposure. Use these markers on dirty, oily, or rough surfaces, since cleaning the pipes prior to marker application is not required. May also be used for older plants or when quick installation is needed, like in new construction. Snap-on markers also provide 360 visibility.