These Rotring 2mm HB refills fit the Rotring 300 Clutch Pencil and come in a pack of 12 leads.
Pencils are graded based on the ratio of clay and graphite each pencil contains. More graphite gives a softer, darker line while more clay makes for a harder, lighter line. A HB pencil is equal parts clay and graphite making for a great all around option.
Pencil grades from hardest to softest:
4H, 2H, H, F, HB, B, 2B, 4B, 6B, 8B
|Quantity in Pack