Each piece has strong magnets on the inside where you put two pieces together with a painting, poster, etc in between them. Put one pair at the top of your pbn and the other set at the bottom. It is 16 long (our average pbn) and the painting can be horizontal or vertical. The magnetic wood pieces can be a little shorter or a little longer than your painting and still work you can also cut off a little of the white edges of the painting to make it fit better, if you'd like. It is easy to take one painting out of the magnetic frame bars and put another one in for a new holiday or just if you want something new hung up included is a matching black cord connected to the frame that can be used to hang the painting on your wall.