This necklace stacker clasp is a long tube shape, it opens by pulling it apart, then closes by magnetically sliding it back together - each half come with number of chain rings, you can create your own layered necklace! * Our necklace layering tool can hold up to two necklaces for ultimate layering without getting tangled. * If you have issues putting on your jewelry, these stacking magnetic necklace clasps are easy to use! Start wearing your beloved jewelry pieces again! * All of our jewelry is nickel-free, lead-free, cadmium-free and is safe for sensitive skin. Perfect for all day wear!