Engraved signs are CNC machined with King Color Core, a versatile multi-color engravable high-density polyethylene sheet with multiple layers of contrasting colors. . King ColorCore® has a matte finish on both sides of the sheet. It is environmentally stabilized to withstand the harshest outdoor conditions. King ColorCore® will not rust, delaminate or rot when exposed to UV, humidity or water. King ColorCore® is made with high-impact-resistant polymer to handle more abuse than conventional sign materials.