Vacuum Sealing: This food vacuum sealing kit can be used in combination with a vacuum sealer to help remove all air from the glass jar and extend the life of stored food. Material: This jar sealer is made of high-quality food-grade silicone material, which is safe and healthy. The unique design keeps the mason jar vacuum sealer away from food and helps prevent the growth of mold and bacteria. Airtight Food Storage: The jar sealer creates an airtight vacuum seal on the jar lid, keeping food fresh and preventing odors and moisture. Keep food lasting longer. Dishwasher Safe: This vacuum silicone sealer is easy to clean and can be washed directly in the dishwasher. It is safe, durable, and requires no manual cleaning. Widely Used: This universal vacuum jar sealer fits all mason jars and is compatible with most brands of countertop vacuum sealers. It also works with some brands of handheld vacuum sealers.