This potassium tumbler is part of Sergio Herman’s Surface collection and comes in different sizes. The tumbler’s angular silhouette as well as the thickness of the glass give the design a reassuringly robust look and feel.Please note: Due to transport and temperature variations, a slight haze may appear on our glasses, giving them a matte appearance. This effect is entirely normal and will disappear after one cycle in the dishwasher. Your glasses will regain their beautiful clarity!