These are first cut as flat discs, then with a special mold they are formed. There is only 1 piece of metal here, no solder. These are wonderful for doing Cloisonne. We have annealed these with our torch and water quenched them to clean them, we also put these in acid to clean off any oxides that formed.

BR-05, workshop 1 (9,A-26),
Type of Metal - Nickel Silver, German Silver, New Silver,
Grade of Metal - First Grade,
Gauge of Metal - 26 Gauge,
Measurement - 14.8mm OD, 13.6mm ID, 3.3mm tall,
Quantity - 6,