I will ship this item via Yu-Packet Post. Due to the size being close to the limit, please only bid if you are comfortable with this. Also, as agreed, no returns or exchanges, please. m(_ _)m The internal temperature required to freeze this product is -20°C. Please check the performance of your freezer before purchasing. There are no stains or scratches, but since it is used, please refrain from purchasing if you are looking for a condition similar to new. Note that I only used it for two days, so the condition is good. ↓ This is the product. 【Amazon.co.jp Limited】Logos Ice Pack GT Minus 16 Degrees Hard 600g・2 Pack Long-lasting Disaster Prevention Made in Japan https://www.amazon.co.jp/dp/B0DT83NGZ9 Purchased from Amazon on September 3, 2025. I am selling it because it does not freeze completely in my home freezer and I cannot use it. (I put it in the freezer for over a week) I tried using it without complete freezing, but unfortunately, it was not helpful at all... The following is an excerpt from the "Precautions for Use" written on the main unit. ・ Requires an internal temperature of -20°C. Set the temperature to the strongest setting. ・ Freezing takes 36-48 hours, or more than 48 hours depending on the environment. ・ Avoid freezing two of these products or stacking them with other ice packs. Please refer to the photos on the manufacturer's page for the fully frozen state ↓ Ice Point Pack GT-16℃・Hard 600g https://www.logos.ne.jp/products/info/941