Healthy meals are easy with this space-age steamer! Conveniently cooks fresh and frozen foods right in the microwave, keeping them moist, nutritious and delicious. Two-piece construction with grooved base keeps food above the water for optimal steaming. Plastic. Prepare a plentiful meal in mere minutes! Generously sized containers are made to handle a variety of microwave cooking chores; snap-on lids keep leftovers nice and fresh. 8¼" diameter x 4½" high.