This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Here's a basic eye mask--you know, the type you wear when you're trying to sleep on a long airline flight--that's printed with the unmistakable scowl and heavy eyebrows of everyone's favorite assassin, Golgo 13! Just in case you don't want to be mistaken for this legendary manga and anime character while you're snoozing, the mask is reversible, with the phrase "Never Stand Behind Me" written on it. A sturdy elastic strap keeps the mask snugly plastered against your mug, to keep out every last trace of annoying light. Confuse and irritate your fellow airline passengers--it's fun!