Material: the canning lids are made of grade tinplate material, and , built-in silicone seals that the lid can be securely sealed Wide Use: the mason jar lids can be applied to all kinds of standard bottles, to store , tea, coffee and various kinds of drinks; with good sealing, you can make yogurt for children to take to school or office Easy to use: The mason jar lids lid is metal with a silicone sealed ring, the threaded increase the friction between the palm and the lid, making it easy to open lid can be used in microwave ovens, refrigerators and dishwashers, but they should be dried and stored as soon as possible to avoid rusting Good tightness: The sealing ring inside the lid makes the Mason lid have good sealing performance, air tightness and leak-proof sealing, ensuring that it is suitable for keeping food, grains, seasonings, and beverages fresh, without worrying about putting boiling water. colour: gold + silver + red + rose gold Material: tinplate size: cup lid 70mm Package Contents: 10 x golden mason covers 10 x silver mason covers 10 x red mason covers 10 x rose gold mason covers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.