4 Neodymium Rare Earth Magnets Great For Refrigerators, Arts & Crafts, Science Projects & Organizing Tools. This is a new set of 4 neodymium rare earth magnets. Great for refrigerators, arts and crafts, science projects and organizing tools. Each magnet measures approximately 3/8" (9 mm) in diameter and 3/16" (5 mm) thickWe work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.