SPARQ Home Set of 4 Tulip 2-Oz. Shot Glasses These organic soapstone shot glasses keep liquor chilled by cooling from the outside in; Take the glasses from the freezer and enjoy your favorite shooter out of an icy shot glass with this set that lowers the temperature more than 30 with no dilution or change in taste and for sake lovers, these shot glasses can also be heated in the microwave to keep sake warm till the last drop