Ceramic Swimming Pool Deck Depth Marker " 1.2 M " Abrasive Non-Slip Finish, 4 inch Font Kiln-fired for permanence, can't fade or peel Abrasive Non-slip surface is designed to install on the pool deck. Search smooth to find markers for pool waterline Frost-proof tile Depth Marker measures 5.8 inches X 5.8 inches, with 4 inch font Exceeds ANSI A137.1 Section 9.6.1 - DOCF Acutest