Developed by YKK Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo, Representative Director and President: Hiraki Otani, hereinafter referred to as "YKK"), it greatly removes harmful effects such as cyanide, chromium and selenium without using conventional electroplating chemicals. The material brass material uses the new plating technology AcroPlating® (hereinafter referred to as AcroPlating®) in the life cycle assessment (※2, hereinafter referred to as "LCA") survey conducted by Sustainability Consulting company Peterson Projects BV (※1) , And achieved the result of "mainly having the advantages of reducing the burden on the environment in terms of heat energy use, greenhouse gas emissions, and sludge emissions" (*3).