Aquatic Technology 6605WA1218E 12"x18" White No Diving (In Red Font) Sign measures 12 x 18 inches, is printed on heavy-duty aluminum material and is designed to prevent patrons from diving into the water. Our general information signs are very noticeable and used to inform people of facility restrictions, policy, object location or instruction. This sign is lightweight, durable, and waterproof for indoor or outdoor use.