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This refill pack is designed for use with the Thames & Kosmos Rock Tumbler Essential STEM Tool. It contains a selection of rough rocks, polishing grit, and jewelry settings to extend the tumbling and polishing process. The included materials allow young geologists to expand their rock collections with new specimens. The pack provides all necessary consumables for continued operation of the tumbler system.
ToyDirectory Product ID#: 53160 (added 7/7/2025)
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