The Glencairn Whiskey Glass Set of 2 with 9 Chil 'N Rock Whisky Stones Use: Store in the freezer for at least 4 hours before use add 3 stones to a glass pour until liquid has reached the height of 1 stone let stand for 5 minutes Chill whisky and spirits without diluting Natural soapstone Wash: Rinse and air dry following every use,Freeze for 4-hour before using Tapering mouth allows an ease of drinking capturing the aromas on the nose. The wide bowl allows for the fullest appreciation of the whisky's color