4 Pack Wide Mouth Mason Jar Fermentation Lids (Airlocks Sold Separately): You Will Receive A 4-Pack Of Wide Mouth Mason Jar Lids Equipped With Silicone Seal And Grommet That Screw Directly Onto Your Wide Mouth Mason Jars | | Turn Your Mason Jar Into A Fermentation Vessel: These Lids Come With A Perfectly Sized Gasket That Creates An Airtight And Leakproof Seal Once Applied To Your Wide Mouth Mason Jar, And The Grommeted Hole Is Conveniently Sized To Fit An Airlock (S-Shaped 3-Piece) So You Can Begin Fermenting All Your Favorites Sauerkraut, Kimchi, Kombucha, Water Kefir, Beer, Mead, And So Much More! | | Careful Design: The Convenient Eleven-Sided Design Makes It Easy To Screw The Lids On And Off Your Wide Mouth Mason Jars As Tight Or Loose As You Need Them, And Each Grommet And Silicone Gasket Is Easily Removed For Easy Cleaning | | Made From Premium Materials: Each Lid Is Made From Premium Food Safe Plastic That Is Strong, Durable, And Reusable As Well As Dishwasher.