Strongest available grade 8 ferrite ceramic magnet. Corrosion resistant blocks can be used in most any application. Great for home, office, school, crafts, science projects, hobbies, manufacturing, refrigerators and more. Size: 1-7/8" x 7/8" x 3/8" thick. Durable, high quality ceramic magnets that won't lose their power. Thanks to optimum size, design and force the magnets can be used in totally different fields: Education, Science, Kitchen & House, Office, Building, Creativity & Craft and so on. 1. Great for all Home, Office, Craft, Science Projects and Product Manufacturing applications. Magnets are perfect for glass gems, mirrors, for making refrigerator magnets, and more others.