Soft copper wire : 20 gauge (wire diameter 0.8mm): 2 strands, each long 40 cm (16 inch) 2 cm (0.7 inch) for clasp beads: 4mm ...

Full tutorial video link above the title wire size to make bracelet diameter 5,5cm (can + a few centimeters to depreciate) 20 ...

Your question is about 'magnetic copper' bracelets. Actually, such a thing does not exist because copper is not magnetic. However, both copper and magnetic bracelets have been used to overcome health ...