Set includes one of each character. The heads are separate from the bodies so you could have the earrings worn as pictured above, or you could switch the heads and have mismatched heads/bodies. To give a brief description, the head has a typical post and goes through the hole in the ear. The body has a vertical piece of plastic with a hole at the top and goes behind the ear. The post from the head goes through the ear and then into the hole in the body sitting behind the ear. Then the closure is added like a typical earring after it has been inserted into both pieces. Each earring measures approx 0.75".