This unique buckle closure is magnetic, so it has has excellent holding properties to keep jewelry fastened. Composed of non-ferrous (mixture of non-magnetic) metals, with magnets on the interior tips, each hook measures 1.25 inch (31.75 mm) from end-to-end. This fastener nests together and has a magnetic hold, but it may require the use of an instant-bond glue for assembly. We recommend assembly to be preformed by an adult only. One strand of Bunjee brand bungee craft cord (or any cord 3mm-4mm in thickness) can squeeze into the base. Illustrated assembly instructions are included under the header card.