This innovative marker allows you to easily add high-precision details and highlights to your work. Masking fluid flows smoothly and skip-free; simply cover areas you don't want to be colored, color over them, and rub the masking fluid off with your finger or an eraser. Works great with watercolors, ink, and gouache. Can be peeled off up to a week after application. 0.7 mm plastic tip. Shake well before use and store horizontally for best results.