Are Mcaffeine under eye patches supposed to be unidirectional - rough on one side and shiny on the other?

Hey everyone, I just got Mcaffeine under eye patches and noticed something weird, all the patches are unidirectional. One side feels rough/“matte” and the other side is shiny. I assumed under-eye patches would be the same on both sides, but these aren’t. Has anyone used these before? Is this normal? Am I supposed to put the rough side on my skin or the shiny side? Or did I get them wrong somehow?