The Tupperware 1 Reheat N Serve Square Containers are a set of three black, square-shaped sandwich containers made of BPA-free plastic. They feature a snap lid for easy access and vented design for reheating in the microwave. With a capacity of 475 ml each, these containers are reusable and dishwasher safe, making them ideal for on-the-go meals, office snacks, or picnics. The compact size of 6.5" x 6.5" x 2.75" makes them convenient for storing and transporting food while keeping it fresh.