Each of these 20 marbles has a magnet inside. There are countless experiments one can do, from stringing them together to building 3D structures. It is actually harder than it looks since one has to account for a complex 3D interaction of magnetic fields. Great fun! Set contains 20 magnetic marbles packaged in a handy, reusable plastic container, and it comes in assorted colors.
Features:
This magnet has a strength of: 300 Gauss (0.03 T)
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