Tumblers are machines that rotate a barrel filled with soap flakes and water and stainless steel shot as well as the items to be polished.
The inside of the barrel is not round but has protrusions to help agitate the contents.
For polishing precious metal jewellery the shot is normally stainless steel in several different shapes and sizes. These include balls, pins, ovals and ellipses.
Tumbling precious metal will give it a beautiful shine as well as hardening the metal.
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