16-OUNCE CANNING JAR- jars are perfect for canning all kinds of Special low-Acid food like Fruits, tomatoes, sauces, salsas jam & jellies, pickles . AIRTIGHT SEAL - The band when screwed down, An integral rubber ring on the underside of the lid creates a Leak Proof-Hermetic seal. . DULL SOUND LID - the lid create a dull-sound for freshness. While the bands are reusable, the lids are intended for single use when canning. The jar’s stackability helps you save space in lunch bags and in the fridge until you’re ready to eat or drink!