I bought these pens after finding a small 4-pack of the pastel version on Amazon. I had no success finding the same Tul felt tips in other colors until I checked Ebay. They are very smooth writing and the pigments are bright and beautiful. And, in spite of how bright the colors are, they do not penetrate any paper on which I have used them. I love the Tul line--great quality--and am enjoying using these.