I am an avid illustrator and wanted to try something new as oppose to the cross hatching that I normally do. These markers are incredible, providing so much value from 10-100 percent black. I didn't think I would use so many differences in values but as I did, I realized how much better some of my illustrations began to look. I would probably have preferred a 2nd 10% marker than a 3rd 100% marker, but that's probably because I use the 10% like a blender.