These glass lenses are made especially for the Game Boy Colour consoles with the drop-in IPS LCD mod with the 2.2" screen.
The smaller viewing window compensates for the smaller display from the LCD without leaving large gaps around the borders, making the aesthetics much cleaner.
They also offer much more resistance to scratches.
This lens suits all Freckle Shack, Mcwill, MW and china versions of the same LCD mod.
Adhesive sticker on the reverse and a protective film on the front.