Tired of having to switch your necklace every time you wish to utalize your crystals. Then this is the perfect thing for you. This is a light weighted material that has a small catch at the end. the whole necklace piece is adjustable to fit a large selection of crystal sizes. This way instead of changing the whole necklace piece , you only need to change the crystal. This is also a great way to incorparate your own crystal collection into your everyday life.