This listing includes one piece of ring magnet which is made of grade 8 hard ferrite magnetic material. The internal gauss rating of this magnet is 3,850 Gauss . The surface gauss rating is about 2,000 gauss. This magnet can be used for speakers, science projects and craftings. These magnets were made under the ISO 9001 quality system. CMS' ceramic magnets are proven to be stronger than our competitors' and have a lower defect rate.
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