The Faber-Castell Polychromos Sky Blue colored pencil (ref. 110146) was formulated to reproduce the color of the daytime sky with a smooth, clean, and smudge-free line on paper. Its thick 3.8 mm lead adheres smoothly, allowing for even shading on large surfaces. The Sky Blue shade is the indispensable professional colored pencil in any fine arts kit for landscape artists and illustrators.