Black Silica Raw Stone - Various Sizes, 300-700g Product Specifications Natural Far-Infrared Mineral! Experience the comfort of warming from the core of your body. Product Name: Black Silica Ore Size: 1cm - 5cm [Effects of Black Silica] Rich in natural minerals, it absorbs solar energy and emits ultra-high levels of far-infrared rays and negative ions, characterized by the release of various active waves. It is effective for preserving the freshness of food and plants, deodorization, air purification, enhancing the beauty effects of lotions, promoting the growth of plants and animals, and relieving pain. 300g - ¥880 400g - ¥1100 500g - ¥1300 600g - ¥1500 700g - ¥1680