Metal dome, also known as metal shrapnel, is made of ultra-thin (0.05mm-0.1mm) and ultra-thick stainless steel 301 or 304. The domes are important part of the membrane switch. They apply to membrane switches, contact switches, PCB boards, medical equipment and other devices. Metal domes own benefits of good electrical conductivity, wear resistance and corrosion resistance. They also have the advantages of simple structure and convenient installation. The conductive characteristics determine that they can work in occasions with extremely high reliability requirements and high protection requirements. In addition, the components gain good reputation of small size, light weight, and convenient installation. So they are popular in electronic products. In a word, metal domes are widely used in electronic products due to good conductivity, wear resistance, corrosion resistance, simple structure and convenient installation.