All designs on glasses are with Epoxy Resin. All pigments are with mica powders(used in all makeups and also food & drink safe) Glass Care * HANDLE WITH CARE * WASH BY HAND * DO NOT SOAK * AVOID EXTREME HEAT * DO NOT PLACE IN DISHWASHER OR MICROWAVE All designs are made by hand and a spinning glass tumbler. - Navy Blue, Yellow, Glitter and White - 20oz Coffee Mugs - Set of Two 100% Glass and Two in a set!