The Rocking Tumbler Set has a unique structure to allow these glasses to rest on their side without tipping over. Whiskey stones made of soapstone are included to keep your beverage cool and refreshing without watering it down. The set is perfectly packaged for gift-giving. The set is delivered in a true gift box with ribbon, card and tissue paper included. The machine made glasses each holds 6 3/4 oz of your favorite beverage and is 3" in diameter and 3 1/2" tall. The drink stones are 1" x 1" x 1" and designed from recycled soapstone.