ACM is a lightweight composite material, consisting of two aluminum cover sheets and a fire rated core. It is a simple and versatile product which delivers a weather resistant, unbreakable and shock resistant facade which is very easy to install. ACM is available in a wide range of colors to provide your project with eye-catching designs. MCM (Metal Composite Material) consists of two metal cover sheets and a fire rated core. The commonly used metals are Zinc, Stainless Steel, or Copper, but other specialty metals are available. MCM comes in a nearly limitless array of colors, finishes, reveals, and sizes to customize your building exactly to your design intent.