Easy to Use! Essential product for storing and fermenting kimchi, pickling vegetables, and making delicious sauerkraut. Simplicity! The combination of ancient Korean earthenware principles and modern technology with the highest quality polypropylene plastic makes the ideal fermenter. Healthy! Adjustable inner pressing plate minimizes air inside container, promoting an anaerobic state benefiting the growth of probiotics (lactobacillus). Odor free! Double lids (including inner lid) contains and blocks strong odor and smells better than most containers, also in kitchens and refrigerators. Safe! Food safe, dishwasher safe, freezer safe, microwave safe, heat and cold resistant. All materials are BPA, DEHP and lead free.