The sign holder is 11 x 7 (W x H). This frame has a 2 7/8 x 5/8 x 5/8 (L x D x H) magnetic base for attaching to metal surfaces. The sign holder is 7/16 inch thick black high impact styrene plastic with mitered style edges. This kit is quick and simple to assemble. The sign holder has a slot opening for inserting notices and can be used in either a horizontal or vertical position which gives you more options in signage placement.