7 Pieces Polished Magnet Stone Mineral Rocks. Ideal to develop your mineral identification skills or to hold things in place with their strong magnetic force. These polished stones are tumbled until they are shiny and smooth…a great worry stone with magnet properties. Comes with an attractive faux leather, velveteen pouch stamped with the Online Science Mall Logo.  Pouch comes in a variety of colors.  Yours will be selected from our in-stock supply.