I gifted the National Geographic Rock Polisher to my grandson and decided to include a spare set with him. Kids are still in the polishing phase with the kit included with the polisher, but considering how much fun they are having, as well as a great STEM learning opportunity, this replacement kit will be in use soon. The stones included in the original set (currently polished) are very good examples. Tiger Eye is her favorite. I expect this replacement set to be of good quality as well. That's why we buy the Nat Geo brand.
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