We use 9mm thick MDF (smooth surface) . The item is pasted down on the wood and the sides finished in black.
Items can be laminated or encapsulated in gloss or matt finish,which will protect the image and it will last longer.
When the item is laminated or encapsulated, we have to finish the edges with a thin plastic edging called beading, which comes in black or white.
Items can be beaded without lamination or encapsulation.