'Lightfastness' is a feature of Color pigments not being prone to discolor when exposed to light. This product by Caran d'Ache has "the highest lightfastness available today". 61 of the 76 colors offered, fall in the best category of Lightfastness as per the standards created by the Colored Pencil Society of America (CPSA).

How is this product Eco-friendly?
Cut from California cedar, the Luminance 6901 colored pencils carry the Forest Stewardship Council (FSC) label, a guarantee that the logging of the materials used for the pencils is environmentally-friendly and socially and economically sustainable.

This set of 16 colors is available for $69 at Rex Art.