The organic board is an organic board, and the light box piece is a light box piece. The two things are made of different materials. I belong to an advertising company. I haven't been to Harbin, so I don't know what the bus stop sign in Harbin is made of. I usually make light boxes and use both. . . . The easiest way to tell you is to go to the advertising company and ask, and you can know all the questions you want to know. . . good luck