Made in France Since 1939 Impact Chip Resistant Extremely Durable Duralex Tempered Glass is 25 Times Stronger Than Ordinary Glass Duralex Glass is Very Hygienic It is NonPorous and Does Not Absorb Liquids Colors or Flavours Shock Resistant Manufactured to Withstand Sudden Temperature Extremes From 4 Degree to 266 Degree and Is Suitable for Hot or Cold Liquids Stackable Duralex Glasses and Bowls are Stackable for Convenient and Space Saving Storage Hygienic Nonporous Duralex Glass Does Not Absorb Liquid Freezer Microwave Dishwasher Safe Adaptable Modern Glassware Can Go Directly from The Freezer to the Microwave