Whiskey glass with Granite Stones

Whiskey glass and Granite stones that cool the whiskey like ice. The package includes 2 pieces of 170 ml whiskey tasting glasses and 4 pieces of granite stones for cooling the whiskeys. The stones are cooled in the freezer for about 4 hours, then you can put them in the beverage for cooling without being diluted. Some caution is required so as not to damage the glass with the stones. The box size is 155x120x70 mm.