Caran d’Ache Luminance Professional Artists pencil with a 3.8mm lead offering smooth and permanent colouring experience. They are particularly recommended for mixing, gradations and blending, and also shading and burnishing with a white pencil. All pencils are Premium FSC® certified cedar wood, requires the use of a well-sharpened pencil sharpener, round pencil. Lightfastness indicator LFI or LFII (standard ASTM D-6901). The pencils feature a glossy cap colour matched to the lead colour.