Why Choose NeeyBing Products-Good Material to Seal The lids are made of tinplate. The tinplate material has good thermal expansion and contraction. When used as a sealing material, the container is vacuum-proof and watertight. But the lid is prone to rust when the paint is worn. Please replace the lid as soon as it gets rusty. -Leak Proof: Designed for mason jars, they are leak-free and air-tight. Incredibly durable giving you that ability to keep reusing them without having to forgo any of the high quality. -Lids for Mason Jar Canning Lids It is suitable for sealing the mason canning jars that stored spices, sweets, biscuits, fruits, jams, soft drinks, tea or coffee, and other small objects. Specifications: Material: Tinplate Notes: 1. Manual measuring, please allow 1 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.Buy with Confidence: NeeyBing is committed to providing our customers with high quality products, we are dedicated to ensuring your fully satisfaction. Our company provides customers with service of 18 MONTHS. Please email us if the items have any problem, refund or replacement will be sent. Wide Application: Our leak secure jar lids and rings are perfect for storing fruits, cookies, candies, salad, milk, smoothies, tea, coffee or other small objects. It is suitable for home, kitchen, restaurant, coffee shops, bar indoor cooking, outdoor barbecue ect. Material: NeeyBing Jar Lids and Bands are made of food-grade tinplate material, which has a smooth surface and not easy rusting. In addition, with high and low-temperature resistance, it can be used in refrigerators, dishwashers and microwave ovens. It is also easy to clean and reuse. Mason Jar Lids and Rings Size: each reusable leak proof storage solid cap is approx. 2.73 inches 70mm in diameter, which can be compatible with most regular mouth mason jar. What you will get: You will get 24 pack regular mouth mason jar lids and rings, adequate quantity for you to use, replace and sharing with your family or friends.