  Guitar pickup.
For some reason guitar pickups are advertised as using samarium cobalt magnets instead of the more common neodymium iron boron variety, because they are "lower noise". I have no idea if this is true, but it sounds fishy to me.
Source: eBay seller musicpartsguru
Contributor: Theodore Gray
Acquired: 17 April, 2009
Text Updated: 17 April, 2009
Price: $60
Size: 3"
Purity: <30%
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