This is a Dr. Cool Rock Tumbler. Imagine taking dull, ordinary rocks and magically transforming them into sparkling gems…now you can! With this professional-grade tumbling set from Dr. Cool, making beautiful gemstones is easy.
Ready for take off! This educational and entertaining do-it-yourself science kit contains everything you need to learn how spinning motors and plastic discs are used to launch a paper plane at up to 31 mph (50 km/h). This kit uses spinning motors and plastic discs to launch a paper airplane. Includes components for assembling the launcher and detailed instructions. Requires 2 AA batteries, not included.
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