Rock tumbling is easy. Just place a few rocks or minerals into the tumbler, add grinding powder (included), and select the length of time to tumble. The grindin...
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Rock tumbling is easy. Just place a few rocks or minerals into the tumbler, add grinding powder (included), and select the length of time to tumble. The grinding powder simulates the natural erosion process that would take thousands of years. Soon you will have shiny, polished rocks to use for crafts or to display.
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