This is a ferrous self-reacting oxygen absorber (FW-200) from Iris Fine Products, purchased around 2022. The package originally contained 200 pieces, and approximately 20 remain. The outer bag was heat-sealed with a sealer for storage. As you can see in the first image, the oxygen indicator remains pink, indicating that the deoxygenated state is maintained. I used 180 of the 200 pieces, and I was unsure which "product condition" category to select, but considering that the 20 oxygen absorbers are unused, I chose "Like New." The following is a product description: It starts absorbing oxygen simply by being exposed to air. Because it is a self-reacting type, the packaging form is not much of an issue. By absorbing oxygen inside the container, Sunso Cut has the following effects: 1. Inhibits mold growth 2. Prevents oxidation and discoloration 3. Prevents the occurrence of pests Packaging Features: Water-resistant, oil-resistant Features: Fast-acting to general type Main Uses: Rice crackers, moon cakes, delicacies, rice, nuts, dried goods, spices, karinto, baked goods, madeleines, jerky, etc. Applicable Aw (Water Activity): 0.95 or less Working Time (Standing Time): 4 hours (20S is 2 hours) Deoxygenation Days: 0.5 to 2 days (2 to 3 days for 500 size or larger) Please use packaging materials with low oxygen permeability for food packaging. We recommend packaging materials with an oxygen permeability of 20ml/㎡・atm・24hr or less. For long-term storage or low-moisture products (used with desiccant), use packaging materials with higher barrier properties.