I purchased this at an authorized retailer on the recommendation of my doctor. At the time of purchase, it was 1.01 million yen, including the cover. I will also provide the book. What is Bio Rubber? Bio Rubber (synthetic rubber) is mostly made from petroleum. However, the material of Bio Rubber is made of a special rubber (internationally patented) that contains over 99.7% calcium carbonate extracted from Mt. Kurohime in Niigata Prefecture, a high-purity limestone, combined with precious metals. The Special Structure of Bio Rubber ~Independent Foamed Honeycomb Structure~ A major feature of the honeycomb structure "Bio Rubber" is its honeycomb structure <like an ant's nest> made of micro-sized independent air bubbles. High technology is required to create each of these air bubbles, and this is an important point of Bio Rubber, along with the high quality of the raw materials. Electromagnetic waves at the level of infrared rays emitted by humans and the sun collide with the walls of these internal air bubbles, repeatedly reflecting and concentrating, thereby emitting only bio-waves. Developed and manufactured by Yamamoto Chemical Industry Yamamoto Chemical Industry Okayama Factory Yamamoto Chemical Industry, which develops and manufactures Bio Rubber, has a history of developing special materials in the medical field and is highly regarded worldwide for its X-ray shielding materials.