The Bormioli Rocco Fido Jar Gaskets Set of 6 is designed to restore a secure airtight seal for 4.25oz and 6.25oz Fido jars. Made from durable flexible rubber, these replacement seals ensure long-lasting performance and reliable closure for food storage. Freezer safe down to -4°F (-20°C), they help preserve freshness for jams, sauces, and small portions.