The Caran d’Ache Luminance 6901 40 piece colour pencil set is a combination of the highest lightfastness and the smoothness of a permanent lead. Every shade has been formulated using finely-ground pigments chosen for their purity, intensity and resistance to UV. Colours can be blended, burnished and layered on a variety of surfaces. The casing is made of California Cedar from managed forests. The smoothness of the Luminance 6901 leads require the use of a well-sharpened pencil sharpener. The pencil cap indicates the colour of the pencil lead. High lightfastness and smoothness Swiss made 40 piece assortment Can be blended and layered for various effects Pigments chosen for purity-intensity and resistance to UV.