César uses all variations of charcoal for some of his art. These are natural vine charcoal, compressed charcoal, and pencil charcoal. He also sometimes adds sanguine and sepia and for the bright tones he uses white charcoal or chalk.
He also uses Silverpoint wich is a Renaissance technique.
Papers are from different sizes and colors. Sizes go from A5 to A1. And colors could be white, clay toned, sand toned, and sometimes he tones them with a deluided black acrylic paint, or coffee without sugar, to have grays and mustards colors.