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*UPDATE: Posted are results from the 3rd and 4th grit. The third grit process smoothed out the chips and cracks found around the rocks. The 4th grit result didn't seem to change the rocks much from the third grit tumble.* National Geographic Hobby Series Tumbler is very easy to use and you can see major results, even after the first grit is complete! The kit comes with 9 sharp gemstones which I selected a few from and the others were rocks I found around the yard. The instruction manual will tell you the recommend days for the rocks to tumble for each grit step. There are four grit packages- #1 Coarse- #4 Polish. Each step is a finer grit powder to tumble an average of six days each time. The tumbler is very easy to use by emptying the grit package contents in to the black container, adding enough water to cover the top of the rocks (no more), closing the lid tightly, setting on top of the rollers and after pressing "set" until you select the amount of days to tumble, press the power button to start. You will see the tumbler count down and will shut down once the amount of days is complete. You can use the included strainer to empty the used water/grit mix, rinse the stones and start the next step. We were shocked to see dramatic results from the first completed step! Especially, the stones that are included, the rocks had very sharp edges and deep dents. All of the rough edges were smooth and the dents had smoother lines, as well. After completing the second round of grit the rocks' edges had rounded off and the dents were much more shallow with smoother lines. Now, I am currently on the fifth day (out of six) of round three, the fine grit. Once the third step is complete I will update this review with up-close photos of the rocks' progress. Thanks for watching!