These are papercraft models like a crown cork for beer. The package illustrations are based on the birds and old Japanese toys.

Width-32mm, Height-7mm, Scale-1:1
Creation time-Around 20 minutes
Assembly instructions-Included
Printer paper-Gloss paper①(1-1 ~ 1-3.templates), Size-A4(Reference links)
How to assemble(Reference links)
Printing preferences(Reference links)