The Dove Blending Pen is specially formulated to make inks, chalks and colored pencils blend easier. Fill it with the included Blending Medium and use it to achieve variations of color depth in your art work. The pen is refillable and the nib is replaceable should it ever become worn. The package comes with everything you need including a Blending Pen, one 1 oz. bottle of Blending Medium and three replacement nibs.