- BASIC GREY-Magnet Snaps. Super slim and easy to open these magnetic snaps are perfect for any scrapbook or card project. Use anywhere you wish to add a closure or unique interactive embellishment. They are light-weight and non-bulky, connected they measure less than 1/8in thick. Featuring super strong self-adhesive backing and +/- are marked on each magnet. This package contains ten pairs of 3/8in diameter magnets. Imported.