Arc-shaped neodymium magnet, 28mm (longest dimension) x 10mm wide overall x 3mm thick (1.10" x 0.4" x 0.140"). Plated. Some scratches. 18-22K gauss.
Customer Reviews
(2 Reviews)
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NOT like hard-drive mags: N and S on opposite sides 
Reviewer:
A viewer
from SEATTLE, WA USA
Curved "hard-drive magnets" usually have their N and S poles on the same flat side. These don't, they have one pole on each face, so they're much more useful.
Buy ten and stack them to form one large magnet. Useful in simple generator project for science fairs, wind-power demos, etc. Stick them all over your bicycle rim, so they can drive an iron-core solenoid coil.
Polarity of Magnets
Reviewer:
Broadway LION
from Richardton, ND
I had not noticed an issue with the polarity of these magnets, for my application this is irrelevant. I think that they ARE from hard drives, but packing them in stacks such as they do will have shifted the poles to the faces rather than to the ends. As long as you are not building a hard drive from scratch... : )
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