The stumps and tortillions set are made of good quality compressed paper. They can be sharpened by sandpaper blocks, then be wiped with a napkin. | Tortillions are made of rolled paper, tapered and have the edge of the paper visible, which are excellent for rapid - thin blending on pencil- charcoal | The pencil extension tool can help you use blending stump and tortillions more effective. | Very suitable for students, artists, drawing beginners to sketch or paint details. | Package includes: 9 pieces blending stumps, 9 pieces tortillions, 2 pieces sandpaper sharpen pads blocks;1pieces pencil extension tool