They’re made of rugged clear acrylic with the sides open to insert/remove a sheet of paper or sign. The hardware and instructions are supplied for easy mounting. Then to display a sheet or sign slide it in either side. If there is one already in the display it will be pushed out the opposite side.
Do you require something a little different? Custom sizes both smaller and larger are available with minimum quantities, call us at 1-800-376-2194 to discuss your needs.