Choose from either a 6 1/4" x 6 3/4" Stainless Steel Whiskey Stone Set in Bamboo Case that can be laser engraved per request or a set of 1" X 1" stones that are made from basalt, a natural occurring volcanic rock. Color can vary from black to gray. Put these stones in your freezer, and add to a drink that is ALREADY cold. 9 1" Stones come with black, velvet pouch. Stones can be lasered for personalization.