Blending Stumps are cylindrical drawing tools made of soft paper, tightly wound into sticks and easily shaped with a sandpaper pad. They're used by artists to smudge or blend marks made with charcoal, crayon, pencil or other drawing media. With a stump you can produce gradations and half tones.
Available in three sizes:
#3 - 5/16" x 5"
#4 - 3/8" x 5-1/8"
#8 - 5/8" x 6-3/4"