Package included: 50pcs Mason Jar Canning Lids. Size : 3.38inches/ 8.6cm in diameter. 【COLOR】The color of the Canning Lid is silver, simple and stylish. In addition, you can use a marker to mark food-related information on the lid, or write the date on the lid, which can help you record the time of food production and purchase. 【GOOD SEALING】 Airtight and no leakage, tight sealing. Mason Jar Canning Lids is equipped with a silicone ring. Canning Lids is suit for keeping food, grains, seasonings, beverages fresh. You need not worry about leaking sealing materials contaminate the kitchen or other places. 【ANTI-RUST EFFECT】Canning Lids are anti-rust and rot resistant, you can use Canning Lids to replace your rusted metal lids. You can put it in refrigerator. Canning Lids can be used to store leftovers, fresh sauces or juices, dry goods storage, spices, and other small objects. Instructions 1. Clean the glass jar, wash it for later use. Put the main ingredients and auxiliary materials into the glass jar, do not exceed the neck of the storage jar, pour half-full water, and cover the split lid. 2. Put the glass jar into the pressure cooker, pour the water into the pressure cooker, about to spread over the bottle, cool water is enough, the pressure cooker is safe to operate, the temperature is 120 ℃ and steam for 10 to 15 minutes. After cooking, let go of the steam and let the glass jar cool naturally from high temperature. 3. After cooling, the bottle will make a "pop"! The raised part in the middle of the cap disc will suck downwards, which means you're done! Indicates that the tank has been vacuum sealed. 4. Make the pot of the product. Please wipe the water on the bottle with a towel and store it in a dry and cool place. The product can be stored for up to 3 months. 5.Note : It is recommended that you use this cap separately. If you use them together with the outer ring in a pressure tank or boiling water bath, please remember not to tighten the outer ring too tightly. Too tight will deform the originally intact lid due to pressure or gas distillation.