ABT PRO is a permanent dual tipped art marker with flexible brush tip and chisel tip in one. Brush tip works like a paintbrush to create fine, medium or bold strokes by simply changing brush pressure; chisel tip provides consistent lines and broad coverage for coloring large spaces. Slender barrel for comfortable grip during use. Ideal for artists, designers and crafters. Permanent, fast-drying alcohol-based ink produces rich, vibrant colors that can be layered to create rich saturation, shading and color gradation. Durable nylon brush tip and polyester chisel tip retain shape after heavy use. Each set includes a reusable and stackable desk tray. Gray Set Includes Cool Gray 1, Warm Gray 1, Warm Gray 2, Cool Gray 3, Warm Gray 4, Cool Gray 7, Warm Gray 8, Cool Gray 10, Cool Gray 12, Warm Gray 13, Lamp Black And Black.