Parts List: 1 x Red Fermentation Lid 1 x Fermentation Lid 1 x Skin Color Fermentation Lid 1 x Green Fermentation Lid Description: This fermentation lid features a one way waterless airlock that automatically releases gas to avoid pressure buildup. Equipped with smart date tracker, it allows you to monitor the fermentation progress. Key Feature : You Will Receive : You will receive 4 fermentation lids. Specification : Product Name : Fermentation Lid Size : Diameter 8.4cm/3.3inch, Height 0.3cm/0.12inch Made of : Silicone Color : Multiple Colors Note : 1. There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 2. Please allow slight dimension difference due to manual measurement. Reusable : Made of silicone, it is sturdy and dishwasher safe, resistant to cracking and deformation. It can be safely used for fermenting vegetables like cucumbers, carrots, and garlic Suitable for Wide Mouth Glass Jars : This fermentation lid is specifically designed for standard wide mouth glass jars, featuring a leakproof sealing structure. There is no need to worry about the lid falling off or pressure buildup, making every fermentation process easy and hassle No Burping Needed : It adopts a one way waterless airlock that automatically releases gas to avoid pressure accumulation. No manual venting or water level maintenance is required, making it ideal for users seeking maintenance fermentation Safe to Use : Reduce the risk of jar explosion or fermentation failure. The airtight silicone seal and auto venting valve not only isolate oxygen but also maintain pressure, ensuring that probiotic rich foods ferment Track Fermentation Progress : Equipped with a smart date tracker, it allows you to monitor the fermentation progress at a glance. Say goodbye to guessing and forgetting batches, specifically designed for sauerkraut, pickles, and preserved vegetables, it simplifies the entire fermentation process