New Tendency glass products, such as our Rien Drinking Glass, are manufactured from Borosilicate glass which is particularly robust and heat resistant. Originally used for laboratory equipment and produced in Bohemia (Czech Republic), a region known for its high-quality glass production.

Borosilicate glass is dishwasher safe. For cleaning, use a soft cloth or soft brush with warm water and a mild detergent. For polishing, use a soft dry cloth, ideally cotton or linen.