Safe MaterialThese wood jar lids are made of natural wood which is safe to use, never get deformed or rusted. To ensure your lids fit perfectly for a long time, keep them dry Good SealingA sealing gasket is embedded in the middle of the wide mouth mason jar lids for seal, which is not easy to age, wear- resistant, and has good sealing performance Versatile storageThe canning lids fits small to large mason jars and can be used for storing leftovers, fresh sauces or juice, storing screws and nails, dry storage, spices and more Wide applicationsFeaturing with detachable silicone ring, flexible to use, they can work with glass of 58 - 68 mm diameter mouth. Diameter of straw hole measures approx. 15 mm/ 0.59 inch NoticeYou will receive 8 pack bamboo jar lids, glass mason jar is not included; Do not use water above 85; Clean and dry the lids after using.