The word "tetrad" refers to a group of four and the Tetrad Moon Charm Bracelet features 4 personalized charms, custom-made using the moon phases from the dates of your choice. A tetrad of moons provides you with an opportunity to symbolically unite four significant life-events or individuals. This is the ultimate family bracelet. And like the moon itself, our awe-inspiring lunar phase charms catch the rays of the sun by day to illuminate in darkness -- creating a soft inviting glow that will surely be a conversation starter! Let it capture your imagination and be a forever reminder of what and who is important to you.