The Pentel Sharplet-2 economical mechanical pencil has such features as button automatic lead advance, plastic clutch mechanism, ridged finger gripped barrel, removable pocket clip and built-in eraser with cap found in more expensive drafting pencils. Use the Sharplet.5mm pencil to produce a fine line; the.7mm to create a medium line and the .9mm to draw a thick line. The pencils when used with Pentel leads write smooth and produce lines that resist smearing and fading. Sharplet pencils have Pentel super hi polymer HB refillable lead inside.