It's an NES cartridge!!! That's Nerdwax Entertainment System. No need to blow on it though... just breathe on your lenses and use it to Wipe Your Glass! 

Note: Do not insert into gaming console; will result in big bummer

The Jinkies Game Cartridge Cloth is great for cleaning smears and smudges off your Sunnies Specs & Screens.

All Jinkies® branded microfiber cloths are guaranteed to remove Nerdwax from lenses.

DIMENSIONS: 5.75" X 5"