-Made of lab-quality borosilicate glass, our mixing bowls are resistant to scratches and stains, suitable for storage in the fridge or freezer and heat-safe for the microwave or oven. In three versatile sizes that nest together for space-saving storage, you can rely on the superior durability of these thick glass batter bowls for all your baking and cooking prep. Material: Glass, Color:Natural. Also could be used for mixing bowl,durable mixing bowls,bakeware,batter bowls,prep bowls,serving bowls. By Cost Plus World Market.606899