Seals tightly on all smooth rim containers. Microwave, stovetop, oven and dishwasher safe. Prevents spills by creating an airtight seal on any smooth-rim containers. Creates an airtight seal to keep food fresh for longer and seal in heat during cooking. Reusable silicone means no more wasting or struggling with plastic wrap or aluminium foil. Safe at high temperatures up to 220 degrees Celsius. Dishwasher safe.