Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : 5cm ( 2 inch) for each butterfly 20 gauge ( wire diameter 0.8mm ) : 2cm ...
I used : abacus crystal : 20 bead 4mm, 20 bead 6mm Soft copper wire 20 gauge ( wire diameter 0.8mm ) : 2 strands, each 45cm ...