Tombow Mono Zero Eraser - 2.5 mm x 5 mm - Rectangle - Silver Body

These are the best. The thin eraser is fantastic for fine detail work. Just make sure to purchase extra refills as the eraser is only about 2 inches in length.

While the standard circle style Mono Zero easily found a use in my kit, this one is still struggling to find it's place. The flat thin shape of the eraser makes it difficult to make sense of what it's ideal function is.

It's too wide to be precise, unless you use the corners of the eraser, in which case it's hard to see what you're erasing. It can be used as an all around eraser intended for a less precise function taking advantage of it's wide coverage. In that case it's kind of a rare beast to be used for everyday use. Keeping a healthy stock of refills might prove difficult in the long run.

Again, like the other models of Mono Zeros, the eraser does not extend to the bottom of the barrel. It's about three inches long with a plastic lead extending the length which feeds into the advance mechanism. While it sucks to have an eraser shorter than expected, the quality is tops. Tombow definitely knows how to make things disappear. Plus, it looks way cool.