German manufacturers of pencils and colour pencils do not use toxicologically dangerous heavy metals or heavy metal compounds in their products.
Such heavy metals or heavy metal compounds could only find their way into those products as pigment impurities or through mineral raw materials. There would only be trace concentrations of these substances, well below the prescribed ambient standard.
The use and waste disposal of wood-cased pencils is unproblematic as they are made of innocuous raw materials.