12mm Bakuhanseki Maifan (Medical Stone) plain rounds have a 1mm diameter Large Drill Hole on the strand measuring 15 inch with 31 beads. Maifan stone (maifanite) described in the compendium of Chinese medicine from the Ming Dynasty, the stone came to be called "an amulet for improving health & luck" due to strong healing and purification abilities. Bakuhanseki Maifan stone contains micro-nutrient elements of Calcium, Iron, Zinc, Magnesium, Copper, Selenium, Quartz and other minerals. This stone was named Bakuhanseki (Barley-rice stone) because it resembles the appearance of rice boiled with barley.