OverviewIt sounds like you're talking about a high-quality rectangular Pyrex casserole set, which comes in three pieces made of refractory glass and fitted with air-tight plastic lids. Here are the details of this set: Set specifications: Material: Thermal glass: The casserole is made of thermal glass that is able to withstand high temperatures of up to 400 degrees Celsius, making it ideal for use in the oven and microwave. Air-tight plastic lids: The lids are designed to prevent spills and keep food fresh, with a silicone vent icon to make it easy to release steam when needed. Casserole sizes: 410 ml: A small casserole ideal for serving small meals or storing small amounts of food. 680 ml: Medium size suitable for storing and serving ready meals for individuals or small families. 1040 ml: The larger casserole is suitable for cooking and serving large dishes. Additional Features: Microwave and oven safe: withstands high temperatures up to 400°C. Freezer safe: withstands temperatures as low as -20°C. Dishwasher Safe: Easy to clean and can be washed in the dishwasher without problems. Silicone Ventilation Icon: Located in the lids to provide ventilation while heating or cooling. Multiple uses: Oven casserole: ideal for preparing and cooking foods in the oven. Refrigerator containers: Suitable for storing food in the refrigerator for long periods. Lunch containers: ideal for travel and trips, as well as for daily use at school or university.