Persimmon tannin rice bags are one of Japan's ancient food preservation techniques. They exhibit insect repellent, anti-mold, anti-corrosion, antibacterial, and water-repellent properties, and the protannin (polyphenol) is said to prevent food oxidation. ★ Made with domestic odorless persimmon tannin liquid ★ Re-coated before shipping (total: 6 coats) ★ Multiple coats are applied to the bottom, which is susceptible to moisture ★ Can be reused by drying in the sun.