What is the name of the paper placed in the transparent mobile phone case?

Laser paper, commemorative cardboard. The paper placed in a transparent mobile phone case can be laser paper. The surface of such paper has an effect similar to the flow of light and has a very strong visual impact. Placing it in a transparent mobile phone case can make it more personalized and recognizable; You can also place commemorative cards inside the transparent phone case. The content on the paper can be about your favorite idol or the person you admire. You can see it often and it can also decorate your phone.