This sign holder can be used in the vertical or horizontal position. The frame is high impact black styrene plastic with mitered style edges. This sign holder is 8 1/2 x 11 (H x W) and 7/16 inch thick. The enclosure has a 4 1/2 x 5 1/2 inch center base and works on counters, tables and other flat surfaces. This sign holder is simple to assemble and the cards insert easily into the slot on the top.