This necklace is made with genuine Hokutolite from Taiwan, crafted meticulously by a professional, first-class licensed jewelry artisan. The cord has deteriorated due to long-term storage. Taiwanese High-Purity Hokutolite Necklace Negative Ions, Natural Radium Approximately 11.6g (The sticker will be removed before shipping) If you prefer to keep the sticker on, please let us know and we will ship it as is. Negative Ion Count: Approximately 5000 Radium Level: Approximately 0.4μSv/h (Measurement without a window) Measurements without a window do not detect alpha waves, so the actual value including alpha waves will be higher. This windowless measurement is a suitable value. Also, if the windowless measurement is abnormally high, it may indicate a fake with high beta and gamma radiation, which is harmful to the human body, so please be careful. Our Hokutolite is from before mining was prohibited and is available only while supplies last. Genuine Hokutolite is extremely valuable and is said to be beneficial for health, such as cancer prevention.