Safe material: the rubber jar seals are made of high quality food grade silicone, which is non-toxic and odourless and very safe for your daily use. And they are not easily deformed or damaged by stretching, making them practical and durable. Airtight and replaceable: Our silicone seals will maintain a sealed environment for a long time, you can use them to replace your broken or old seals and help create a new airtight and leak-proof seal for your glass jars. Wide range of uses: Silicone bottle seals can be used to seal fruit, vegetables, spices, juices, homemade food, homemade products, etc. They are suitable for refrigerator storage, pantry storage, beverage transport, etc. Size: Each silicone replacement gasket is 70mm in diameter and fits Mason jars or most normal wide-mouth glass bottles with lids. The bottle top gaskets are soft enough to stretch slightly to fit the bottle top. Package includes: You will receive 20 jar gaskets, enough for your daily use and replacement, a good value for money.