Andy is right, and I've told my customers I use the same precious resin. Then add that the Mont Blanc pen is a "Mercedes" of pens but like "Mercedes" it's mass produced, your now holding the "Buggatti" of pens all mine or hand made one at a time of the fineist componets. Gets them thinking all the time...Heres a link to Mont Blanc showing a ver high end pen calling it "Black presious resin". http://montblanc.com/products/111.php