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Ever try to draw a circle on the whiteboard? Not so easy even with a compass, because the line usually breaks or the whole circle is twisted out of shape.
With this magnetic ring set, we can now draw perfect circles of different sizes on whiteboards. Works like magnetic circles, just place the ring of your choice on the whiteboard, and with the board now grabbing tight on the ring, you may draw perfect circles any time and every time.
Huang, Chi Ming
New Taipei City, Taiwan