Ceramic (hard ferrite) disc magnets are among the most economical magnets available and are commonly used in manufacturing, craft and hobby applications.
Ceramic magnets are a dark charcoal gray in color and do not appear metallic.
Some ceramic disc magnets can be magnetized with several poles on one face to give greater holding strength on that surface. (This gives a lower holding force on the opposite surface.)
Ceramic magnets are not suited for high-temperature applications (over 250° C).