Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : 2 and 2.5cm ( about 1 inch) for each links have beads 4 cm ( about 1.5 inch) for each ear hook 26 gauge ( wire diameter 0.4mm ) : 10 cm ( 4 inch) ...

You can use any wire you have. Large diameter wire will be more difficult to manipulate, but will increase the rigidity of ...