I have a client looking for a quote on what to me appears to just be custom stairwell signs for a building in either engravable or photopolymer materials. The architect specs out "best sign systems" or "asi" materials. Any one able to clue me in on what that is? Is it a company, a material, a process? I have done a few jobs like this but just rely on my vendor to engrave the templates i produce and never really asked about material type. Any help is appreciated.