Tupperware 6-Piece Rock 'N Serve Set with Seals Six containers for cooking meals in advance, freezing, reheating in microwave Containers: large deep, large shallow, medium deep, medium shallow, two small Rock 'N Serve valves vent steam during reheating Virtually unbreakable; see-through; dishwasher-safe Lifetime warranty against chipping, cracking, breaking, peeling