Rose_Wolfbaine

well, a click eraser is about the same length as a standard pen. it has a long, hollow barrel that one loads a long eraser in that they can adjust the length of. kind of like an eraser version of a mechanical pencil. Normally, the eraser itself is somewhat wide (that is, about as round as a normal pen) but with a lead pointer, you can sharpen the end into a fine point.

example

Well, I know someone who uses a separate lead pointer to sharpen those weirdo long click erasers for REALLY fine details. Not sure how much that might help you, but it could be a start.