1) Diameter is 18mm(0.71"),thickness is 4mm(0.157")
2) it is Ferrite Magnets,not strong magnets
3) it is Grade 5.
4) it is highly stablility udner difficultal environment.
5) notice:It is only for science,cr...

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1) Diameter is 18mm(0.71"),thickness is 4mm(0.157")
2) it is Ferrite Magnets,not strong magnets
3) it is Grade 5.
4) it is highly stablility udner difficultal environment.
5) notice:It is only for science,craft and production use,Not toys.
6) 30 days Unconditional refund.


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