bowls are crafted from superior quality opal glass that has passed internal tests and outperforms stoneware by as much as 3x in impact resistance and 4x in chip resistance. These bowls are finished with a smooth high-fired glaze that adds a brilliant shine and creates an ultra-hygienic, non-porous surface for an easy and convenient cleanup. Not only are these bowls durable and break-resistant, but they are also microwave, dishwasher, and freezer safe, providing you with every convenience you need in your serveware! Simple and sleek design will go perfectly with most table settings.