This Oil Pastel Set has a collection of 36 Plein Air colors, with more grays, blues, and greens in the range. They are packed in a foam-lined wood box that is great for protecting the sticks while traveling. Sennelier Oil Pastels were born out of the needs of Picasso, who wanted to paint without a brush and experiment on a variety of surfaces. These pastels do all of that and more. Sennelier pastels have more pigment than any other brand. WARNING: This product contains a chemical known to the state of California to cause cancer.