Since 1945, when Duralex invented the glass tempering process, the name Duralex has been associated with toughened glassware, utilizing their proprietary process. Dishwasher, Microwave and Freezer Safe. Borosilicate Glass, Mass Tinted, Chip Resistent. # Pieces In Set: 4 Features: Microwave Safe, Chip Resistant, Shatter Resistant, Dishwasher Safe Measurements: 3.43 Width/Inches, 3.43 Depth/Inches, 3.54 Height/Inches Capacity: 8.3 oz. Base Material: 100% Glass Care: Dishwasher Safe Material: Glass Country of Origin: Imported