These beautiful glasses are guaranteed! Classico glassware is machine blown in parma Italy and made in luigi bormiolis proprietary son.hyx material. Glassware made in son.hyx is extremely brilliant in color, maintains its clarity after thousands of dishwashing cycles, and possesses an extremely high level of durability and strength. These glasses have thick shams, fine rims, elegance, weight, sophistication, and consistency. Luigi bormioli has developed an unprecedented guarantee program for these glasses! The 25 year guarantee covers chipping on the rim or foot as well as any discoloration or cloudiness resulting from washing. Lead-free and dishwasher safe. 13.5 ounces.