The Tombow ABT PRO is a permanent, dual-tipped art marker with a flexible brush tip and chisel tip in one. This set of five gray tones allows for various color gradients from light to dark. The brush tip works like a paintbrush to create fine, medium or bold strokes by simply changing brush pressure; the chisel tip provides consistent lines and broad coverage for coloring large spaces. The permanent, fast-drying, alcohol-based ink produces vibrant colors that can be layered to create rich saturation, shading, and color gradation.