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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This is a great rock tumbler. It hasn’t leaked at all and we’ve run it several times. We did find that you have to let it dry completely before using the polishing powder. We made the mistake of letting it get mostly dry and the powder stuck to the sides of the tumbler and to the rocks themselves. My 8 year old daughter has loved using this kit to make her own gems.