Art Alternatives - Blending Stumps - 6-Stump Set - (1 of ea. size) - Excellent for blending and smoothing pastels, charcoal, graphite or any other dry media. Double-ended, pointed and made from soft, gray paper felt these stumps are easily sharpened with a sandpaper block. This 6-Piece Set which contains one each of six sizes (1/8in, 3/16in, 1/4in, 5/16in, 3/8in and 7/16in).