These F/A-18E/F/ [F 414] Exhaust Nozzles (for the Meng Kit primarily) are a recent release by the Chinese manufacturer Fab Scale. Fab Scale’s online presence is hard to find with the provided QR codes stating that the site can’t be reached. The same is for the supplier, Warspite Model Company. These are nice drop-fit replacements for the exhaust on the Meng kit and I suspect it would also fit the Hasegawa kit.
The sturdy box protects the three pieces, each in their own protective Ziplock pouch. There are no instructions included but since this is a rather simple assembly, it is not detrimental. The box art [line drawings] shows the arrangement of the three parts. I removed the 3D supports with a hobby knife, which was easy, and after a quick clean up the parts were ready for painting.