The company that created tempered glass manufactures the original french tumbler
Duralex is 2-1/2 times more resistant to breakage and chipping than regular glass, and can withstand sudden thermal shock from -4-degree F to 212-degree F
Duralex glass is extremely hygienic, as it is non-porous and does not absorb liquids, colors, or flavors
The products are safe to use in the dishwasher, fridge, and microwave and will maintain their original appearance for many years