
I've gotten a few questions about the type of pencils, erasers, etc that I use  for work.  Some artists use #2 pencils and others use $25 mechanical pencils.  It honestly doesn't matter what you use-- as long as you are comfortable with it.
1)   Tru-Point Lead Pointer for drafting pencil lead.  This thing works great!  It's the best lead pointer I've ever used.  It works very smoothly and always gives me such a pointy tip.  The only drawback is that it's a bit of a pain to empty the graphite.
2)   Koh-I-Noor Drafting Pencil.  I like using these drafting pencils to get the variety of line weights.  The line thickness changes as the lead dulls.  I use H lead and I go through about 12-14 leads per month.
I think I got this from Top Cow years ago.  They used to supply us with all of our art supplies.  Anyways, I remember grabbing 3 of these from the supply room because I tend to grip the pencil pretty tightly and press down hard as well-- and I would break these every few months.  I've been lucky with this one- it's lasted me at least 4 years now. 
3)   Alvin Draft/Matic 0.3mm lead mechanical pencil.  I use this for really fine background detail-- the only thing is that the line weight stays pretty uniform throughout the drawing.
4)   Sakura Electric Eraser.  I picked this up about 6 months ago and wondered why I didn't do so years ago.  This thing is awesome-- I can't live without it now.
5)   Tuff Stuff Eraser Stick.  Great at erasing really small parts of the drawing.
6)   Kneaded Eraser.  I can't live without this thing either.  I go through about one a month.
7)    C-Thru Ruler. 
That's it.  The penciler's supplies are pretty simple.