This sign from Accuform keeps workers alert to hazards involved in men working above them, most importantly the danger of falling objects. Made from plastic, aluminum and adhesive vinyl materials with a highly visible 10" X 14" size. Plastic is semi-flexible, .055" thick, economical and appropriate for medium-duty use - indoor and sheltered outdoor environments. It has enough flex to mount on slightly curved areas. Warns of people working directly above Reads, "Danger: Construction Area KEEP OUT" High-quality plastic is appropriate for everyday medium-duty marking.