The Charles Viancin silicone lids are ideal for covered cooking, steaming and food storage. This material creates an air tight seal to keep food fresh for longer and seals in heat during cooking. The unique design fits on any smooth rimmed bowl or pot, including glass, ceramic, wood and more. Spills are prevented by creating an air-tight, water-tight seal around any rounded surface. Safe at high temperatures to help prevent stove-top splatters and retain steam during cooking. Re-useable, means no more wasting or struggling with plastic wrap or aluminum foil. Convenient, unique and functional - a must have for any kitchen. Made of silicone9 inch diameterMicrowave and oven safe to 220 degree Celsius (428 degree Fahrenheit)