Knock them together for an electrical effect. Develop and exercise problem-solving, fine motor skills, organization, concentration, and so much more!
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2 quartz rocks with piezoelectric properties
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Spark and glow in the dark when rubbed against each other
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Do not hit these rocks together - just rub
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Best observed in a darkened room
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A product of the USA
Check out all the available Copernicus Toys here