Amazon.com.au:Customer reviews: Starter Rock Tumbler Kit for Kids– Includes Rough Gemstones, Polishing Grits, Jewelry Fastenings, and Instructions – Great STEM Science Kit for The Future Geologist, Boys and Girls Ages 8+
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We purchased this to tumble and polish rocks my children have been collecting. We stared with the rocks that were included in the kit. The tumbler works well and isn’t as noisy as other tumblers. But we are disappointed to find out the rocks we have been tumbling for 3 weeks won’t shine with the powder included in this kit. We were also disappointed that this tumbler can only tumble very small amounts of small rocks.