Tiny pieces 1/4" - 3/16". The diameter is slightly less then 1/16".
Good for chip work
Bullion is a hollow coiled metal wire tube that can be couched or sewn on like beads.
French Check Purl Embroidery Bullion Thread 2 Strands - 9 Colors
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French Gold ,Silver Rough Purl Embroidery Bullion Thread 2 Strands