From what I've heard, the white/transparent film can be used for both silicone and plastic cases, while the silver and gold film work only to print plastic cases. And the price makes the difference too. The cheapest one is the gold film, from China. The silver and transparent films are more expensive and made in Korea. I have never tried all of them to see the difference, but my supplier insists on transparent film and after reading some of the posts here, it seems that the gold one makes a lot of problems.