Colouring and drawing with pens has never been so easy and fun! Koi Coloring Brush Pen is a series of excellent Sakura Japanese pens. Professionals and hobbyists are attracted to them because they appreciate their quality and versatility in use. They are suitable for drawing, colouring, decorating cards, albums, art journals, calligraphy, comics, fashion designs, illustrations, caricatures and even serve as rubber stamps. They are completely safe, they can be used by children because their odourless ink is made from water and non-toxic dyes. They have a flexible brush tip made of nylon, which is similar to paint brush application. Depending on the pressure, the lines may be thin, medium or wide. The pressure absolutely does not destroy the tip - immediately after subtracting from the sheet, it returns to its original form. Specially patented formula of ink makes it possible to obtain beautiful and uniform gradations of colour. The ability to blur them with water provides spectacular, watercolor-like results. They work best on smooth (but not slippery) paper.