*Materials of Good Quality: Jar Sealer For Mason Jars is made of high-quality food-grade silicone material, safe and high-temperature resistant, and durable for long-term use. *Air-Tight Design: Rubber Seals For Glass Jars have good air tightness, can firmly fit without leakage, and can be used in dishwashers and microwave ovens. *Multifunctional Design: Canning Supplies can be used in many daily activities, keep your food clean and safe inside the canning, ideal for storage sealing of fruits and vegetables, homemade foods, toiletries, paints and craft supplies, and more. *Ingeniously Made: Rubber Gasket For Glass Jars is crafted with a smooth appearance without burrs, not easy to deform, and allows you to keep fruits and other food fresh for a long time. *Diverse Applications: Jar Gaskets For Locking Jars fit most standard regular/wide mouth mason jar lids, come with 20 pieces replacement silicone seals, are easy to clean and reusable.