Brilliant - Icy Stainless Steel Cube Chillers in Plastic Storage Tray, Set of 6 6 stainless steel ice cubes to cool your fine drinks without diluting its flavor Includes storage tray for easy storage Made of quality steel, they are filled with a non toxic gel that will keep them cold for longer Rinse before the first use and freeze the rocks for at least 2 hours before placing in a glass These rocks are dishwasher safe, but rinsing under a tap is all they need