High-quality material: Rubber rings made of high-quality food-grade silicone, reusable, non-toxic, odorless, durable, safe and reliable. Product dimensions: Outer diameter: 9.5 cm/3.7 inches, Inner diameter: 7 cm/2.8 inches, Thickness: 3.5 mm. The rubber ring is suitable for most glass jars, food storage containers, etc. Easy to use: Easily replace the yellowed and worn old silicone rings with our high-quality silicone rings for glass food containers. They will effectively prevent dust and air from entering, keeping your food clean and safe. Good sealing: The silicone rings create a good airtight seal on most standard-sized glass jars or pots, keeping your fruits, vegetables, jams and sauces fresh and clean for a long time. Wide application: A good choice for sealing glass food containers, you can use it to store jams, sauces, kimchi, preserved fruits or vegetables. Suitable for placement in refrigerators, in shady indoor places, when transporting food, etc.