Flow Brush from the Best Quality line of OAS combination brushes stiff bristle core surrounded by soft natural hairs Flow's hard bristle core gives it resilience and the ability to do lines, and its soft outer hairs provide the perfect suppleness for fuller shapes. wonderful for small scale subjects; offers superb delivery of bone strokes and full shapes, bamboo trunks, knobby branches, rounded flower petals, leaves, animals, calligraphy, etc. The ultimate small-scale combination brush for Chinese brush painting, Japanese Sumi-e, Asian calligraphy, Asian brush painting and even Western watercolor painting.