The value derived from rare earth magnets is in their magnetic abilities, not just the materials from which they have been formed. This particular type of magnet has been proven to be one of the strongest kinds of permanent magnets currently available. There are four different properties by which magnets are rated; this value is dependent on the magnetic strength as well as its length of duration. The neodymium and Samarium-cobalt are two types of man-made magnets that are often used today because they offer these specific properties.