This set of 2 chilling stones from Metrokane keep your beverages cold without diluting them. Only 1 stone is needed to chill each drink as they are large enough (you can't swallow them by accident either!). The jumbo size chilling stones are made from durable stainless steel and comes with a storage container that keeps them clean and secure in the freezer when not being used to chill your favorite whiskeys and other drinks.