This set includes 4 reusable ice cubes made of stainless steel. Each ice cube measures 2.5cm / 1 inch and will keep your drink cold without diluting its taste. The reusable ice cubes are filled with non-toxic gel and are safely sealed to keep them cold longer. The smooth rounded edges ensure the cubes will not scratch your glasses. The reusable ice cubes can be stored in your freezer to ensure they are ready for future use.