A simple white-board pen and/or eraser holder. It can hold up to six Expo pens, two erasers or a combination of both. The pens also don't have to be from the Expo brand, pretty much any whiteboard pen will fit into there.

I mounted it directly into the wall next to the board using a single screw (my board isn't magnetic). An alternative would be using magnetic tape and putting it on the white board directly.

This thingy has following dimensions: 130 x 78 x 32 mm or roughly 5.25 x 3.5 x 1.2 inches.

Happy printing!