Signage 85 3/16″ -1/4″ Plastic Foamboard Sign Corners (4MM) Review Posted on January 13, 2018May 30, 2018Author FluffyLeech FREE USPS PRIORITY MAIL SHIPPING TO CONTINENTAL U.S. DESTINATIONS – 1-3 DAY DELIVERY ABOUT 2″ X 2″ VISUAL SIZE ON BOARD. POLYPROPYLENE. ALSO GOOD FOR GLASS CORNERS