These decals are precision cut, satin finish polycarbonate laminated, partially pug proof, and will technically last forever. Sold individually, easy to apply, easy to remove.... but why would you?
These decals also SHOULD fit on aftermarket controllers that use the same moulds as original NES controllers, tested on a Hyperkin controller they're ALMOST an exact fit, but I can't guarantee your controller is the exact same measurement as an Orginal NES controller. They do NOT conform exactly to the curved edges of a Hyperkin Cadet, but they come close enough if you don't care about a slight gap on the bottom corner.
Vs. UNISYSTEM, Playchoice-10, and Red Tent overlays are Nintendo Arcade cabinet inspired, and do NOT include a black A button, but the buttons can be found online and are easy to swap out if that's the look you're going for.
The NWC 1990 and TwinFAMICOM overlays are sold in a set of 2 only, they're numbered player 1 & 2 so it doesn't make sense to split them up for individual sale.
The Red Tent metal foil decals are more expensive due to the nature of the media they're printed on, it's REAL metallic foil to mimic the orginals they're based on not just fancy art tricks, they're shiny AF. Expect to see another metallic overlay in the future.