Mechanical Pencils

The ones I like at are the "Pentel Sharp Mechanical Pencil". Normally I order the blue ones (.7mm). The product ID seems to be PENP207C. There is a line of Pentel P207 pencils, the .5mm and .9mm are alright as well.

Lead for the above is PEN50HB (or B or H). Erasers are PENZ21.