Joie's set of 3 Stretchable Silicone Seals fit securely over most size round bowls, plates, cans, and jars to seal in freshness. Simply slip it over the opening of containers for a liquid-tight, airtight fit. They replace the need for plastic wrap and aluminum foil for less waste. Made from silicone, Joie's Stretchable Silicone Seals are heat safe to 400-degrees Fahrenheit, flexible and foldable for easy storage, naturally nonstick, and dishwasher safe for easy cleanup.