Rayson in Rayson Industrial Zone, Huasha Road, Shishan, Foshan High-Tech Zone, Guangdong, China. Main products China medium firm mattress manufacturers-. medium firm mattress The product stands out for its highly stable mechanical properties. Treated under heat or cold temperatures, its mechanical components can stand up the extreme conditions. It is friendly to the environment. It will not generate pollution such as VOC, lead, or nickel substances on the earth when it is disposed of. medium firm mattress is manufactured based on multiple procedures including traditional shape forming methods, high-temperature pyrograph, and glazed coloring. It has fine texture, smooth line, and attractive pattern. The extraordinary workmanship and quality excellence are reflected in details.