Alnico magnets can lose their magnetism if dropped, stored without keepers, or while demonstrating repelling magnetic poles. Instead of throwing these valuable magnets away, remagnetize them! The Remagnetizer restores the magnetism to Alnico horseshoe and bar magnets in just a few seconds. No electricity required. (Remagnetizing is often provided as a service in school supply stores, or schools may purchase this item for their supply room.) 5" long x 2 1/2" high. To be used by adults only.