Bi-metal plate: Lithographic plate where the printing image area base is usually brass or copper, and the non-printing area is usually stainless steel or chromium. Used for printing long runs.

• 双层金属版:印纹部份常用黄铜或铜为底层，非印纹部份常用不绣钢或铬为面层的柯式印版。大数量印刷时所用的版材。