Letters cut by CNC cutting or laser are formed by selecting side band depth according to letter size. Generally, the back surface is produced as PVC foam. Optionally, light can be emitted from the side band or can be produced as Vacuum. 

Most of the illuminated acrylic channel letter products consists of acrylic. You can choose any color from the ready color options, if you want to have specific color or images can be produced by digital printing method.