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This is the step reference Step 1: add walnut shell media Step 2: add rocks Step 3: add walnut shell media Step 4: then tumbler Specifications: Generous 5 lb. capacity Powerful direct drive motor No-slip rubber feet for stability Easy-to-follow rock tumbling instructions Rugged rustproof polyethylene drum and securely sealed lid Objects for your collection Great for nuts, bolts, coins and other small metal objects up to 7-3/4 in. in diameter How a rock tumbler works: The motion in the barrel of the Tumbler simulates the natural action of flowing water or ocean waves. Beaches and riverbeds contain rocks and pebbles smoothed by water and the abrasive sand it carries. As rocks grind upon one another with constant water and sand in the mix, they begin to round and smooth. Although this is a constant process, it does not however, naturally polish the rocks. The Tumbler uses an abrasive media instead of sand. It is graded by grain size, from fine powder sized grains, up to large sized grains. By changing (usually by weekly intervals) the grain size, rotating from coarse, medium, to fine, the rock or gemstone is smoothed much more quickly than the natural process. To polish using a Tumbler, add a metallic oxide compound (not included). The complete process for a gemstone or rock to go from rough to smooth, polished finish, usually takes 4-6 weeks. Great way to start a rock collection: Rock tumbling is a fun activity for children of all ages and promotes an interest in geology and science. Introduce your kid to science the fun way. 100% Satisfaction Guaranteed - With a manufacturer lifetime warranty you can be sure you will get a quality gift.