☆ Please read to the end. ☆ Please also check the contents of the self-introduction section. ☆ Size: Approximately 9.3 cm in diameter, approximately 0.8 cm thick ＊＊----------------------------------＊＊ Excerpt from the back description ＜Materials＞ PVC, stainless steel, sodium acetate solution 【How to Use】● When this product arrives, if it is crystallized and solidified, restore it to a reusable state according to the "Reusing Method" below. *It is solidified due to transport impact, etc. There is no problem with the quality. ● When you press and bend the metal button inside the main body several times, the liquid will crystallize and generate heat. (If it doesn't generate heat the first time, press and bend the button again). ● Wrap it in cloth, etc., to prevent heat from escaping, and the heat retention effect will last longer, and the warmth of about 40 degrees Celsius will last for about 1 hour. *The reference temperature assumes that you are wearing it. Also, there will be differences depending on the outside temperature. 【Reusing Method】 Put the used main body in boiling water and boil it until the white crystals completely disappear (about 5-10 minutes). Once it has completely returned to liquid, cool it with running water, etc., and it can be used again when the heat is gone. ＊＊-------------------------------------＊＊ ☆ Shipping method Simple packaging with recycled materials from home. Please note that we are not responsible for any loss or accidents during shipping. ☆ The color of the actual product may differ from the photos. Please understand. ☆ Including used items, new items, and items described as unused, they are stored at home (long-term home storage) and inspected by amateurs, so there may be oversights. Please refrain from purchasing if you are nervous or seeking perfection. ☆ We strive for quick and courteous transactions, but my work is irregular, so it may take some time to respond to questions or contact you after purchase.