Signs are made of ½ inch mdf, a wooden building material which won't warp or crack. The material is smooth, without knots and makes for a much nicer finished sign.
Each sign is cut to shape and painted with acrylic paint and sanded. The design is then painted on, each individually and each is a little different. A final top coat of a catalyzed varnish is applied and the sign is ready to go.  Key-hole slots are cut in the back for hanging on a nail or screw.  The sign slides onto the nail or screw and fits flat against the wall.