This item has never been used: Tupperware's innovative all-in-one dish that is microwave, convection oven, dishwasher safe! Goes from freezer to fridge to microwave! Perfect for roasted chicken, breads, stews, veggie casseroles, and so much more. Set includes one each 2-Qt./2L base, 3/4-Qt./759 ml base and cover. Rounded corners in the base and the domed cover optimize heat distribution and reduce hot spots that can result in overcooking. Steam release vents on the sides of the base and cover help prevent steam build-up and regulate humidity to brown your food nicely while retaining optimal moisture.