RCR Cristalleria's Stack collection exemplifies space optimisation with its efficient design. The Stack double old-fashioned tumblers feature an innovative anti-scale drainage system on the bottom, ensuring optimal cleaning in the dishwasher. These tumblers also excel in performance, maintaining cocktail temperatures up to three times better than regular glass tumblers. Crafted from Eco-Crystal glass, they are super transparent, incredibly lightweight thanks to the use of pure raw materials, and have been tested to withstand over 4,000 washes in professional dishwashers.