Quantity: each set contains 30 packs jar lids 70mm / 2.8 inches in diameter, 16 mm / 0.6 inches in height; These jar lids are only suitable for standard mud pots, but not for other types of wide-mouth bottles Material and design: made of good quality stainless steel, durable and lightweight, built-in silicone seals ensure that the lid can be securely sealed; The of jar lid is designed with thread so that increasing the friction force to open the jar Feature: the metal cover is durable, not easy to damage and can be repeated to use; At the same time, our mouth jar lid is different from other plastic covers, and its composition does not contain BPA substances or other plasticizers Good sealing performance: the stainless steel jar lid has good sealing properties, so you don't need to worry about leaking problems that can contaminate the kitchen or other places after seal Apply to: suitable for sealing the jars that stored spices, sweets, biscuits, fruits, jams, soft drinks, tea or coffee, nails, screws and other small objects These jar lids are only suitable for standard mud pots, but not for other types of wide-mouth bottles.