We used 1mm copper wire and 1.5mm silver wire. Make your ring by bending it around and soldering it. Beat this around on your triboulet with a plastic mallet.
Then place the ring in the middle of the press and clamp it between the vice. Now tighten it up, loosen it again and tadaaaa.. You have a ring with a great shape.

• You can also use a hammer if you dont own a vice (we recommend a plastic or other medium-hard hammer here, not steel)