Rectangular "ceramic 8" magnets. These measure 1.5"x 0.75" x 0.25" and are magnetized through their thickness, ceramic Grade 8 is the strongest ceramic material available. Ceramic (ferrite) magnets are composed of strontium carbonate and iron oxide. They are charcoal gray in color and usually appear in the forms of discs, rings, blocks, cylinders, and sometimes arcs for motors.
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