Silver Brushes unique blend of natural squirrel hair and black synthetic filament creates ideal working tools for the watercolorist, silk painter, and artists working with inks, d1, acrylics or gouache. Squirrel hair holds large amounts of color and releases it with perfect control. By itself, squirrel is delicate. So they blended it with a synthetic to resist wear and maintain a wonderful snap and spring. This soft blend allows multiple layer glazing without disturbing previous colors, yet its firm e0ugh to lift color with a gentle scrub.