6 LBS Large Weight 4 Step Rock Tumbler Grit Set | Tumbling Media Refill-CoarseMaterial Aluminum, Plastic 4 Steps Be Patient. There are 4 total cycles, 7 days each to have pretty rocks gems. Step 1, 60 Coarse Silicon Carbide Grit. Step 2, 220 Medium Silicon Carbide Grit. Step 3, 500 Fine Silicone Carbide Grit. Step 4, 1200 Aluminum Oxide Grit. Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of