"Aya" was produced by Akashiya as a ink brush pen to draw water painting. "Aya" is blurred representation of moistened with delicate drawing and water by the brush touch the pike, is easily enjoy soft shade representation. Water Brush Pen is the one with water in the container. You can express bluur or conbination of colors together with the use of water color pensils. So you dn't have to prepare a bucket to rinse it and dram water-painting touch pictures anytime and anywhere.