The tumbling action of the steel pins constantly rub against the jewellery item at high speed. The resulting 'hitting action' shines the metal to a very high lustre.
You can see the tiny metal shots spinning around the beaker. The are now 'tumbling and hitting' the pieces of jewellery.
This is a photo of large pieces of steel pins. Some 'tumbling shots' are made of plastic, but in my estimation steel pins work best.
When you are storing them, you can either dry them, or keep them in a liquid, as I do.
This is is an additional photo of another magnetic tumbler, but with a larger capacity for larger jewellery items.
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