We use the bones of fresh cuttlefish sold for sashimi. First, we thoroughly wash them with food-grade sterilizing water to remove slime and ink stains, then soak them in water to remove salt. Next, we simmer them slowly in boiling water for about 30 minutes, removing any remaining slime, and sterilize them by boiling. After that, we immediately arrange them on a steamer and dry them in the sun for at least 3 days to achieve a well-dried finish. Depending on the weather and time of year, if it rains and we can't dry them, we may dry them in a drying room and then finish them with sun drying. As it is something that living creatures consume, we store them properly. Regarding storage after purchase, please avoid storing them in humid places. If they get damp or wet, it can cause mold, so if they do, please dry them in the sun a little. We pack them carefully when shipping, but they are fragile and may chip or break. Please purchase only if you are okay with this. Depending on the stock situation, we may include small pieces or chipped ones as a bonus. Please feel free to use them. We also accommodate requests for bulk purchases, sizes, and quantities, so please feel free to comment.