Quantity: each set contains 42 packs mason jar lids 86mm / 3.3 inches in diameter, 16 mm / 0.6 inches in height; These mason jar lids are only suitable for standard mouth. Airtight & Leakproof: they are leak free and air tight, with a great sleek silver color. the airtight silicone seal locks in freshness for weeks. Feature: the metal cover is durable, not easy to damage and can be repeated to use; At the same time, our mouth mason jar lid is different from other plastic covers, rust resistant material that’s microwave and freezer safe. Can be used for canning up to 190 degrees. Apply to: suitable for sealing the mason jars that stored spices, sweets, biscuits, fruits, jams, soft drinks, tea or coffee, nails, screws and other small objects Good guarantee: We believe in our products, if you have any questions about the products, please contact us!