Water Brush markers are versatile tools for producing watercolor effects in illustration, lettering, sign making and more. Part marker, part brush and part inkwell, the water brushes feature flexible nylon brush tips with squeezable barrels that allow the ink to flow evenly and effortlessly with a touch of the hand. The brush tip produces varied strokes, from fine to big and bold, allowing for endless creativity. The ink is acid-free and water-based. The 6-Piece Set includes black, purple, blue, green, red and yellow. The 12-Piece Set includes black, gray, purple, navy, dark blue, light blue, dark green, light green, lime green, yellow, orange and red.