From the Super Collection. These Le Parfait rubber seals are specially designed to fit the Super jars and Super terrines to create an airtight seal for your food preserves. Made from compostable, natural rubber, these seals are BPA-free and have been used worldwide for nearly a century for long-term food preservation and storage. They can be sterilized and press-fit onto the glass lids of the Super jars and terrines for single-use water-bath or pressure canning processing. The Super Collection of rounded and terrine-style Le Parfait jars has been made in France since the 1930s and recognized worldwide by award-winning chefs and home cooks alike for durability, beauty and versatility. The extra-wide mouths of these jars allow for easy access to food and the attached glass lid and natural rubber seal system provide an airtight and watertight seal for the contents inside. Use these jars for storing bulk pantry goods, canning in-season foods en masse, making infused beverages, small-batch fermenting, zero-waste lifestyles or even for your next cold-brew coffee or tea. The rounded bodies of the super jars make them ideal for fresh produce and sauces while the straight-sided (slightly conical) bodies of the super terrines make them perfect for meats, seafood and layered creations. The possibilities are endless with Le Parfait Super wide-mouth collection of jars! Please see the attached replacement sizing chart to determine the size needed for your jars and remember to replace it with a new rubber ring to ensure a perfect vacuum seal before each canning event. These are replacement parts and are intended for single-use when preparing foods for long-term preservation using the canning process.