Comfort is expensive. In recent years, the output is scarce, and things are rare. Shudula stone is formed by the eruption of a specific volcano in the southern hemisphere, which is limited to New Zealand. Because it is mixed with basalt and other rocks, it is difficult to find Shudula stone. Soothing mouth is expensive and the output is small. Many countries will buy raw stone or finished products from Shuzui for making medical devices, and Shuzui is more expensive. At present, there is no specific pricing for Aurora 23 crystal, and the market is chaotic. Therefore, comfort is expensive.