Named after the Lys River which traverses through France and Belgium, Lys Square Bowls by Duralex, are symbolic of what this wonderul tributary used to represent to some of France’s most famed artists: clarity, simplicity, utility, and of course, beauty. Lys Square Bowls by Duralex are clear, stackable, and safe for dishwasher and microwave. Because they are both heat and cold resistant, they can go straight from the refrigerator to the microwave. Extremely durable tempered glass – impact and chip resistant. Made in France. Duralex plastic lids are BPA free. They can sustain temperatures from -4F to 158F, and are microwave and dishwasher safe.