EASY INSTALLATION: Adhesive Pool markers are easy to install on any smooth, clean surface with their water-proof bond. They are ideal for pool tiles and pool decks. “8 Ft” Adhesive Pool Depth Marker/Sign, 4″ Letter Height, 20 mil Laminated Vinyl with Anti-Skid Pebbled Surface, 5.75″ x 5.75″, Black and White, Made in USA.