These are the original Picardie Tumbler by Duralex made in France.

Tumbler measures 3 1/2" wide x 4 7/8" high.

This is a tempered product. It can withstand temperature changes from -4°F to 212°F without breaking. You could take a glass out of the freezer and pour boiling water into it and it will not break. It is also microwave safe.

It is 2.5 times more resistant to damage than normal glass. If it breaks because of a very strong shock, it breaks into little pieces so your chances of getting cut is lower.

This glass is non-porous and does not absorb liquids so it's more hygienic

Duralex has its origins in La Chapelle-Saint-Mesmin, in the heart of France, since 1929 . All of their products have been made from tempered glass ever since 1939. All Duralex glassware is made 100% in France.