All designs on glasses are with Epoxy Resin. All pigments are with mica powders(used in all makeups and also food & drink safe) Our Epoxy Resin is ASTM Certified (D-4236) Epoxy (Food &Drink Safe) - All designs are made by hand and a spinning glass tumbler. - MultiColor - 15oz Stemless Wine Glasses - Set of Two Glass Care * HANDLE WITH CARE * WASH BY HAND * DO NOT SOAK * AVOID EXTREME HEAT * DO NOT PLACE IN DISHWASHER OR MICROWAVE