Inspired by traditional tailor's chalk, Art Graf Tailor Shape is a rich, water-soluble square of pigment. It is extremely soft and provides artists with a wide range of shades depending on the amount of water use. Create light, transparent tones or deep, rich, opaque colors. When diluted, the Tailor's Shape acts similarly to an ink. It can also be used dry as a drawing medium by itself and is erasable. Each disc can be used as an entire block to draw or paint with or color can be picked up from the block with a brush, similarly to how you would use traditional watercolor paint. Mix blocks to create an infinite array of colors. Each disc measures 1 3/4 x 2 inches. Made by Viarco in Portugal since 1907.