The stumps and tortillions set are made of good quality soft compressed paper. They can be sharpened by sandpaper blocks, then be wiped with a napkin.
Blending stumps set assorted size: #1, #2, #3, #4, #5, #6, each size 1 pieces; 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.