The Giant Plaks were basically faux-wood plaques with amusing graphics and text on them. The side edges were serrated to further simulate cut wood, and a hole was pre-punched in the top center for easy hanging with a push-pin. They came one in a pack for 5 cents.
Note: These were printed on rather thick cardboard, with some identical thinner-cardboard variations known. An earlier test issue exists; these are also on thinner cardboard with no punchhole, and smooth edges.
The art on these was done by Jack Davis.