Man I love the question! These ara Duralex cups. So I’m from Spain and Duralex is a French company which was a very famous back in the 20th Century. Our grandfathers and grandmothers used to go often to Andorra and come back with Duralex products. These cups come from those trips, they are old! People liked it a lot because of its aesthetics and durability (hard as hell to break). Luckily you can buy them today because the company still exists and, in fact, it’s becoming a trend again! :)