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3 Mason jar lids for making mushroom liquid cultures. 3 for $13 with USA free shipping. The polypropylene lid features a rubber self healing injection port, a high quality .22 micron filter and a silicone gasket to unsure a tight seal. These lids can be used in a microwave, autoclave or pressure cooker. They fit wide mouth mason jars. Mason Jars are NOT included. Check out Mycovations on YouTube (Search "How to make Liquid Cultures for Mushroom Cultivation" to find my video) Leave the lids a quarter turn loose while in the pressure cooker so air can escape, otherwise the injection ports will pop out.