Features: 1. Food grade &Safety: Made of food-grade silicon, this silicone fermentation lids is tasteless and safe. It does not fade under daily temperature and be great for using in kitchen. 2. Automatic venting: There is a bubble on the top has a slit cut in it. No need to burp jars daily to release excess pressure and maintain water levels. 3. Easily use: Maintenance free, waterless, airlock features, it is easily used for pickle making. 4. Reusable: Suitable for most glass jar. Flexible silicone lids gets cleaning done fast and efficiently on dishwasher or hand-washing. 5. Usages: Great for pickle, Sauerkraut, Pickles, Kimchi, even for fruits, vegetable any fermenting food jar cover. Specification: Material: Silicone Diameter: 8.4cm Application: 86mm Caliber Notice: 1.Due to the different monitor and light effect, the actual color may be a slightly different from the picture color. 2.Please allow 1-3cm differs due to manual measurement. includes: 1 x Sealing Cap