Fermentation made easy: Our kit includes 4 high-quality, BPA-free plastic airlock lids that are simple to use and built to last. Ferment to your heart's content! Perfect seal for wide mouth mason jars: Designed specifically for wide mouth mason jars, our airlock lids provide the perfect seal to keep your ferments healthy and fresh. No more soggy sauerkraut or limp pickles! Low maintenance: Forget about vacuum lids – our airlocks don't require constant attention. Just fill them with water, place in the lid, and put on a mason jar. The airlock does the rest, maintaining an anaerobic, CO2-rich environment for happy and healthy fermented goods. Make delicious kimchi and save money: No need to buy store-bought products with preservatives – our kit allows you to make your own kimchi (and other ferments) at home, saving you money in the process. Plus, homemade kimchi just tastes better. Reusable silicone flip-top grommet: Once your fermentation is complete, our innovative silicone flip-top allows you to reuse the same lid for storage. Extra silicone grommets are included, because let's be real, you're bound to lose one at some point. If you do, there's no need to buy new lids – we've got you covered. At Elementi, we are committed to using only the highest quality, food safe materials in all of our fermentation products to ensure the safety and purity of your fermented creations Color Coded Fermentation: Our kit includes four different color lids so that you can easily color code and track your fermented goods