How cute, calling this the Space Intruders Eraser Set. After all, I guess the person (or persons) behind it could not obtain the rights to Space Invaders, so why not take on a synonym instead? The Space Intruders Eraser Set works as it is, where $2.50 will net you a set of three. These are perfect to erase all those mistakes that you make, whether in class or at the office. Get enough of these and you might just have an imaginary game of Space Invaders, oops! Space Intruders, I mean, right there and then on your work desk.