The strong natural curve of the hook is practically wrist-ready. Both parts of this closure are composed of non-ferrous (mixture of non-magnetic) metals. The hook measures 2.875 inches (73 mm) from end-to-end, and the loop measures .75 inches (19 mm) long. 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.