The plates are hung using adhesive discs. The 4" disc can support a plate up to 6lbs. They have little metal hooks so they're easy to hang, and the discs come right off with hot water! From Hobby Lobby: The small ones were 1.99, the large ones were 2.99.
Plates In the Pink: Part shelf, part window treatment, this plate display spans the width of a window with color and style. Mixed plates, platters, teapots, and smaller pitchers combine to make an eye-catching display.