These are stones shaped like ice cubes. They are made of steatite. Steatite is safe for food, has the ability to quickly gain and hold the desired temperature for a long time. Cubes allow you not to dilute drinks with water, which is inevitable when using ice. Precisely regulate the desired temperature of the drink. They do not react with the contents of the glass without adding or removing anything. That is, they are completely safe for humans.
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