The name Kamoi seems to be related to the material. Most listings on google show some sort of tape. I also saw some indications about that tape related to masking for painting automobiles but I haven’t gone on a search for a local automobile paint supplier yet.
I found that Green Stuff World has 200 x 300mm sheets. If I order directly from GSW it’s a pack of 2 sheets for about $2.50. But the shipping. I found someone here in the states who sells them for about 60% more.