Suitable for all watercolor and gouache painting, colored pencil drawing, paint painting, colouring, shading, detailing, illustrating and coating need Suitable for kids, students, and artists Simply unscrew the watrecolor brush pen body to add water, colored inks Easy to control the inks, water flowing through the brush tip by squeezing the pen rod This water brush pen works great as Watercolor Brush Pen; Gouacha Painting Brush Pen Nylon hair brush tip can hold a point fairly well Great for colored inks, gouache paint, powdered pigment, use with watercolor crayon, watercolor paints, water-soluble pencils, water soluble pigments This paint brush pen featured flat and point tip Clear pen rod which is easy to squeeze