The Pyrex Smart Essentials 6 Piece Glass Mixing Bowl Set with Lid can be used for mixing as well as storing food. The bowls are made out of Pyrex glass and the covers are made out of plastic, which ensures that it is sturdy and durable. This six piece bowl set is refrigerator, microwave, and oven safe. The Smart Essentials 6 Piece Mixing Bowl with Colored Lid Set by Pyrex requires minimal effort for cleaning and can simply be placed in the dishwasher. It is nonporous so that it does not retain odors, flavors, or stains. Each lid of the bowls in this set has a different color.