Different Brush Head Vary in Hardness---The hair materials of this water brush pen has different hardness, the white one is softer and the brown one harder. 2 Style & 6 Pieces in One Set---There are 2 style and each style has 3 different sizes pens in one set, which can meet your various writing needs. Exquisite Piston Design---This water brush pen adopts exquisite piston design, can be filling water and ink, which can save time of repeated dipping while you are practicing. Qualitative Materials---This water brush pen is made of high quality plastic and faux fur materials, which is superior in quality, if carefully maintained, they can have longer service time. Wide Range of Application---This water brush pen especially suitable for practicing calligraphy on water-writing cloth, and they can also can be used as general calligraphy brush pens for writing, drawing and painting, which are rather practical.