Based on this product's specifications, here are some alternatives and similar models
Springos KI0107 Stone Ice Cubes for Drinks
Summary description:
Springos KI0107 stone ice cubes are designed to cool beverages without diluting them. Made from natural stone, these reusable cubes maintain the original taste and temperature of your drink. Ideal for whiskey, spirits, and other chilled beverages, they offer a practical and elegant alternative to traditional water-based ice. Simply freeze the stones before use for optimal cooling performance.