This professional quality line of markers features odorless and non-toxic alcohol based inks. They feature a broad chisel nib and a fine drawing nib on the other side. The shape of the barrel allows it to be gripped easily and prevents if from rolling off inclined surfaces. Technically one of the best markers offered in the world today. Superb colors for all illustration and rendering techniques. Unusual to their spectrum is Green and Blue Greys. These ranges open up many more sketching and design possibilities. The quality and value is guaranteed.