This necklace is made with genuine Hokutolite from Taiwan, and is carefully crafted one by one by a professional craftsman certified as a 1st-class Precious Metals Jewelry Manufacturing Technician. The cord has deteriorated due to long-term storage. Taiwanese High Purity Hokutolite Necklace Negative Ions, Natural Radium Approximately 12.6g (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 0.15μSv/h (Measurement without a window) Measurements without a window do not measure alpha waves, so the actual value including alpha waves will be higher. This measurement without a window is just right. Also, if the measurement without a window is abnormally high, it indicates a high possibility of a fake, with high levels of beta and gamma radiation, which are harmful to the human body, so please be careful. Our Hokutolite is from before mining was prohibited, and is available for sale only while supplies last. Genuine Hokutolite is extremely valuable and is said to be beneficial for health, such as cancer prevention.