all of the black and whites were drawn with graphite pencils (if it's the brand you're asking about, i've been using derwent). as for hardness and softness, it varies. sometimes i just stick with hb, other times i'll use an f, b or h. to get a full range of value, sometimes i'll use a very soft lead on the darkest areas, then step up to harder leads as i pencil in lighter shades. for example, i may use 6b or 7b for the darkest shades, step up to an f or h for the mid-tones, then finish off with a 6h or 7h for the highlights. the problem with this process is that you have to be careful not to use a soft lead on top of a hard lead, which necessitates some degree of planning before you dive into the drawing.
whenever i get the time, i'll have to go through the drawings i have posted and list the different pencils i used for each one (if i can remember which i used, that is). did that answer your question very well?