The multiple sizes are enough for different aspects of your sketch drawing artwork. The stumps and tortillions set is made of high quality soft compressed gray paper, suitable for smudging, creating shadows, softening line, hazy effect, blending or smoothing pastel, charcoal, chalk and pencil drawing artwork. Useful tool for artist drawing, sandpaper pencil sharpeners can make your charcoal, pencils or your stumps and tortillions sharpen. This charcoal blending stumps and tortillion set can be sharpened by sandpaper blocks.Use them for blending pencil, pastels, and charcoal. Keep the stumps pointed by sharpening them with a sanding block. The kneaded eraser can be used to creare any shape that makes the seem bright and smooth in the prosess of sketching. Colour: as shown Material: paper Package Contents: 6 x Carbon strip (soft/medium/hard 2) 1 x Eternal Pencil 1 x No need to sharpen pencil 3 x Refill 2 x Eraser 1 x plastic rubber 1 x sponge rub 2 x sandpaper board 8 x Paper rub pen 9 x Sketch drawing pen 1 x Pencil extender 1 x Storage bag Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.