That's what we call them.  These are blending tools to use with charcoals and pastels for blending.

Create dimension in your pastel paintings and charcoal or colored pencil drawings by adding shadows and blending colors. To do this, you need a tool to blend the color laid down on the paper or canvas. We call our blending tools stompers. This category encompasses tortillons, blending stumps and artist chamois. While some artists use crosshatching to create drawings with dimensions, the most realistic drawings use shading to create depth. We've also included our selections of charcoal, colored pencils, pastels and other drawing supplies so that you can quickly and easily find what you need.

We call them stomps, but they are simply tools used for blending to create shadows in a drawing.

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