This is a basic outdoor sign which was done for the Mercer County Model Airplane Club(MERCOMACS) of Greenville, Pa. The sign panel is a 1/4" thick, corrugated fiberglass composite, called Cor-Lite. Cor-Lite is pound for pound stronger than steel. The white surface of the material is treated to withstand the suns damaging ultra-violet rays which makes it an excellent subtrate for out door signage. Black premium vinyl on this one.