The range is made by the renowned French manufacturer Arc International using their patented Kwarx technology (complete transparency, superb strength, and sparkle that’s retained even after use in the dishwasher). The Le Cordon Bleu Glasses are Kwarx Quality, which is a highly resistant material, with an elegant never ending sparkle finish. Given a fine overall glass bowl shape with no distorting of shape or 'magnifying' effect sometimes seen on other Champagne glasses. Extremely thin fine rim to glass design, allowing more concentration of the Champagne on the mouth.