This is an F-type pendant filled with CMC (Carbon Micro Coils). It shows signs of use, with minor scratches and cloudiness. It was purchased online. I had an inspection certificate, but I have lost it. I will include it if I find it. Although it is not from the CMC Research Institute, the inspection certificate showed no difference in electromagnetic wave shielding effects compared to genuine products, indicating it was equivalent. When I wore it, my mind became quiet and my dreams became more vivid, but I felt my consciousness sinking deeply, which was not suitable for my daily use. After much deliberation, I have decided to list it for sale, hoping it can be passed on to someone who desires it. I am unsure about the pricing, so some negotiation is possible. (I need money for moving expenses and would like to use any proceeds to cover them... however, my primary intention is to pass it on to someone who truly needs it. Please refrain from purchasing if your intention is to resell.) Thank you for your consideration. --- I have made slight revisions to the text.