Duralex 9-Piece Bowl Set, Model 100109 Multipurpose nesting bowls are 2 1/2 times more resistant to shock and breakage than normal glass Made in France by the inventors of tempered glass, these bowls hold everything, from spices to egg whites Tempered for cold or hot ingredients, these Duralex bowls withstand temperatures from -4 to +266 degrees Fahrenheit Dishwasher-safe; Microwave-safe; Freezer-safe