The sign frame is 8 1/2 x 11 (W x H) and 7/16 inch thick. This holder is made of black high impact styrene plastic. The sign frame has mitered style edges and a slot opening for inserts. This kit includes a magnetic base that is 2 7/8 x 5/8 x 5/8 (L x D x H) and attaches to most metal surfaces. The sign frame can be used in both the vertical and horizontal position.