Attach notices, memos, and other items to magnetic surfaces with these heavy-duty magnets. The tub contains small, medium, and large magnets so you can pick out the perfect size, and five assorted colors let you color-code items or create a colorful display. These magnets are perfect for use on file cabinets, with whiteboards, and other magnetic surfaces. Offering three times the strength of traditional magnets, these Staples heavy-duty magnets are perfect for securing thicker papers, bundles, and heavier items.