The phrase "paper: sketchbook pro 9" likely refers to either the digital paper/texture capabilities Sketchbook Pro 9 software or a physical 9-inch sketch book Digital Software: Sketchbook Pro 9
To run Sketchbook Pro 9, you'll need:
: Dynamically generates complementary, split-complementary, analogous, triadic, or tetradic colors directly on the color wheel. sketchbook pro 9