Aquatic Technology 5608WS1218E 12"x18" Yellow Slide Rules Caution Sign with Graphic measures 12 x 18 inches, is printed on .040 mil Styrene Plastic, and is designed for safety reasons to be posted at the slide. This general purpose slide rules sign can be posted in most states with pool slides. Our Caution signs indicate a potentially hazardous situation which, if not avoided, could result in moderate or minor injury. This sign is lightweight, durable and weatherproof for indoor or outdoor use.