SPLIT DESIGN: Mason Jar Lids and Silicone Seals Rings can be used separately or in combination, easy to clean and replace. You can wash it by hand or in the dishwasher. DURABLE & SAFE: Mason Jar Lids are made of tinplate, can be reused many times, and are resistant to high and low temperatures. Seals Rings are made of food-grade silicone material, so you can eat and store food safely. GOOD SEALING: The sealing ring of Mouth Canning Lids has good sealing performance. It can prevent liquid and gas leakage, keep food fresh, a necessity in the kitchen. ENVIRONMENTAL PROTECTION & WIDE APPLICATION: Canning Lids with good airtightness can store spices, jams, beverages, tea, coffee, etc. No need to use plastic bags for storage, greatly reducing plastic waste.