<p>This is the real thing! 
Use Ring and disc magnets; the rings N up, the discs S up
or vice versa.
Forget the usual four-cubes design, as it does not allow any carbon sample spinning freely other than an perfectly machined ring or disc!
</p>
<ul><li>Ring magnets: OD 19mm, ID 9.5mm, T 6.4mm, N42</li>
<li>Disc magnets: OD 9mm T 5mm, N42</li></ul>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/63794141@N00">yellowcloud</a> from Germany
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/yellowcloud/4647853887/">Rectangle</a>