Master Artist Thomas W Schaller by Neef 118 Mop Brushes Are Made Of Pure Black Synthetic Squirrel Hair, It Has The Shape Of A Large Round Brush When Wet. The 118 Brush Is Truly A Magnificent Watercolor Tool That Comes To A Fantastic Point. No Other Synthetic Mop Can Perform As Well In This Shape.  Every Watercolour Painter Will Fall In Love With This Great Brush.