This listing is for a full set of Planetary Pendants. By buying the full set you save the price of one pendant. There are 2 styles and 4 sizes. Please see the first image your style choice and the 2nd and 3rd images for sizes. Each pendant comes with an 18 inch black cord necklace that can be adjusted to 20 inches. They are made of alder wood and are 1/8" thick.