The Ultra by Gibson Olstead 8 Piece 5.5 Inch Tempered Opal Glass Bowl Set is made with a versatile simple design for every meal and celebration. This set of eight is perfect to layer with plated patterns and designs to create a unique table setting. Constructed with tempered opal glass that is stronger than regular stoneware. The high fired glaze creates a more hygienic, fully vitrified surface with almost zero porosity. This set is dishwasher, microwave, and freezer safe for easy storage, clean up, and reheat.