I scan my pencils now and printout blue lines to ink, so what I pencil with is all but irrelevant now. I can 'pencil' with a dried turd now if I wished, as long as it made the marks I wanted (No, I haven't used one..yet). For Sturgeon I'm using all kinds of tools to "pencil"; ink wash, litho crayon, markers, brush and ink, ball point pens, whatever.
The pencil art doesn't even have to be very tight, or clean. These pages are literally a mess sometimes, but who cares? The finished art doesn't depend on the pencils, at least not for THIS book, so I'm go at the pages like a cave man at times. Scribbling and scrawling marks however I please.
I don't mean the pencil it's self, but the penciled page otherwise refered to as the "pencils".
PS- Almost forgot, just wrapped up week four of the Monster-a-day project!