Features: High strength is not easy to damage, smooth appearance and easy to clean. Instead of traditional ice cubes, it lasts longer and does not melt and dilute, so it won\'t change the taste of the drink. Two kinds of ice cubes are available for choice, which is more convenient to take. The stainless Whiskey stones provide for rapid cooling and a more sustained freezing. You just need to wash it by water and put it into air conditioner after using it and put it into the cup while using it.