The Sennelier Ink Brush Pen features a brush tip made of real fibers, ensuring a fluid, flowing application of color. The flexible brush tip allows artists to create extremely fine to very wide lines (up to 10mm) with a continuous flow of ink, by simply varying the pressure of the tip on the paper. The ink is pigment based and exclusive to Sennelier; it is environmentally friendly. 24 of the 36 colors are from Sennelier's La Petite Aquarelle range, allowing watercolorists and illustrators to harmoniously complete the details and highlights of their works in watercolor. Equally suitable for lettering, journaling, painting and watercolor.