Set 3 Derwent Assorted Blenders Roll of slightly porous paper tapered at both ends, used to blend charcoal, sanguine, pastel. Allows you to smooth and extend strokes and make gradients. They can also be used as drawing instruments. Ideal for small details. To get a longer point, tap on one side. The paper will move to the other side, making the other end longer. It is recommended to lightly rub the tip before use with sandpaper for smoothness. To clean the remains of carbon, pencil, etc., sand again to avoid dirtying the drawing. Material: compressed rice paper. They come in a convenient pack of three sizes ranging in diameter from 5.5mm to 10.5mm. Brand: Derwent.