This is a sheet of water-slide or dry transfer decals for marking aircraft models.
Released by Quinta Studio in Ukraine, these are the "3D Decals" for aircraft kit interiors!
These products, which are thickly printed on a resin base, precisely reproduce instrument panels and console panels.
To use them, soak the printed parts in lukewarm water as you would decals, remove the printed parts from the base paper, and then adhere them to the parts of the kit that have been flattened by scraping off the mold where they are to be attached, using PVA glue (woodworking glue) or epoxy glue. Take this opportunity to try them out!