Smithsonian Rock Tumbler Toys a mechanical 3D wooden puzzle

a mechanical 3D wooden puzzle that brings the magic of early film projectors to life

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Smithsonian Rock Tumbler Toys a mechanical 3D wooden puzzleTurn rough rocks into beautiful, polished stones that you can use to make charms, bracelets, keychains, and more. Begin by tumbling the included rocks in a barrel with water and grit, then repeat this cycle using progressively finer grits. In just weeks, the Smithsonian Rock Tumbler mimics the process that takes oceans thousands of years! Turn rough rocks into beautiful, polished stones! Includes accessories to make charms, bracelets, and keychains.