This is a set of 4 Uchide no Kozuchi (magic mallet) made from natural smoky quartz. Each piece has an A-ring, so they can be made into keychains or pendants. Smoky quartz is a type of quartz crystal, a transparent natural stone ranging in color from smoky brown to black (Japanese name: Kemurisuisyo/Chasuisyo - smoke crystal/tea crystal). It gets its color from trace amounts of aluminum exposed to natural radiation. It is popular as a talisman for warding off evil, healing, mental stability, and achieving goals, and is widely used in accessories. The "Uchide no Kozuchi" (magic mallet) is a magical hammer that appears in Japanese fairy tales and legends, said to produce anything you wish for when swung (such as gold coins, feasts, and wealth). It appears in the belongings of Daikokuten (one of the Seven Lucky Gods) and in the story of Issun-boshi (Inch-High Samurai), and is popular as a lucky charm for financial fortune, prosperity, and the fulfillment of wishes.