Truly amazing Mellow Stones are cut from high quality Taiwan Black Jade. They smooth and enhance the flavor of your favorite drink (wine, whiskey, vodka, tequila, etc.), and tone down aggressive tannins and acidity. A young wine or whiskey, for example, takes on the characteristics of a finely aged drink. The science behind it is complex, but real and well researched. To use, place in your favorite drink for about 10 seconds for 10% alcohol wine, and 40 seconds for 40% alcohol drinks. From that point, you can experiment a bit with each drink to find the perfect flavor for you. Durable and infinitely reusable. Just rinse after use. Every few months you can leave in the sunshine to 'recharge' the stone. Each box contains two (2) Mellow Stones, one set of quality tongs, and an ornamental cloth drawstring storage bag (pictured). Includes free International shipping from Taiwan.