Easy Clean Stainless Steel Lids with BPA Free Silicone Valve: Made from stainless steel, these fermentation lids are durable, odor resistant, and easy to clean by hand or in the dishwasher. Each lid includes a silicone fermentation valve BPA FREE, offering safe and beginner-friendly gas release without extra tools. Easy Date for Every Batch: Quickly twist the built-in dial to mark the start date of your ferment. Perfect for keeping multiple jars organized without sticky notes or confusion. Works well with any fermentation jar, including your kimchi containers. Automatic Gas Release No Extra Setup Needed: The one-way valve lets gas escape naturally while blocking outside air-no need for burping or airlocks. These fermenting lids are ready to use out of the box, making them ideal for beginners and part of any practical fermenting kit. Leak Proof Natural Seal for Busy Kitchens: With its thickened rim, each lid fits snugly on wide mouth mason jar lids and stays sealed even if moved or tilted. A great upgrade for small-batch home projects, from kombucha to your next pickle kit recipe. Fits 86mm Wide Mouth Jars in All Common Sizes: Designed for 86mm openings, these mason jar lids wide mouth fit standard 16oz, 24oz, 32oz, and 64oz jars. Whether you're making kimchi pickles or vinegar garlic, this lid ensures a secure fit every time. Great for Batch Fermenting at Home: From sauerkraut to mead, these fermenting jars handle small and large batches with ease. Pair with your favorite fermentation weights or canning kit for a simple, clean, and rewarding DIY experience. Color:Silver Material:Stainless Steel Package Contents: 4 * Fermentation Lids Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.