Accuform Signs "DANGER DO NOT OPERATE" Accident Prevention Safety Tag with do not remove tag warning on back measuring 5 7/8" X 3 1/8" is printed on 10 mil polyolefin based PF-cardstock with no wood or paper content. Tag is ideal for indoor or short-term outdoor use and is designed to identify clearly and alert staff about cautions. The matte surface is scuff-resistant and effortless to write on with pen or marker. Top has a 3/8" plain hole and endures extreme environments. It will not crack, distort or shrink. It recognizes the potential dangers regarding elevator or escalator use or access.