Cow Magnet Determine North & South poles, and other basics of magnets Pack Of 2 Believe it or not farmers actually feed magnets to their cows to get rid of any metal objects these somewhat dim-witted beasts may have ingested while eating their regular food Cow magnets are popular with dairy farmers and veterinarians to help prevent Hardware Disease in cattle. While grazing, cows eat everything from grass and dirt to nails, staples and bits of bailing wire USE these to discover how a magnet attracts, determine North and South poles, and other basics of magnets 0.5- inch diameter x 3-inches Pack of 2