each is a 6"X6" wooden block that was primed and then painted so they made up a composition. HOWEVER, each one has FOUR nails in the back and wire wound round so they can be hung in ANY configuration on your wall, that you see fit. Play Blocks for ADULTS! Move them around... make different groupings, hang them vertically, horizontally... YOU decide. Let me paint a set for YOU! $300 for a 12-block group. PERFECT for a kid's room. It's modern art you can PLAY with!