28 X 20 Inches Aluminum - Safety First This Department Has Worked (Dry Erase Marker Insert) Days Without A Lost Time Accident Avoid Accidents (Grn/Wht Box) Lost Time Accident signs are made of aluminum, 28"x20" (Inches) and have a dry erase area for dry markers or magnetic area for magnetic numerals. Don't see it - We can make it. We will customize lost time accident signs for you. Fill out a simple online form by clicking here.. Alternatively, you can call toll-free 1-866-753-6257 or email customerservice@tuffrhino.com  for a custom quote.