In Book of ZACK he gives an insight into his career on steel at the time

You control the flow by squeezing the body of the marker

staying flat under moderate to heavy wet media

Coloration: Mass-dyed natural sand — acid-free

The pen comes empty

tombow mono light touch plastic eraser Os Gemeos In Book of ZACK heThis eraser uses a softer, lower friction polymer than a typical rubber eraser, built specifically for thin or delicate paper vellum, lightweight sketchbook pages, or anything that tears easily under normal erasing pressure. It binds to graphite on light contact rather than needing firm scrubbing to lift the pigment, which matters most for clearing pencil guidelines around fresh ink work, where heavy pressure risks smudging nearby lines. The crumbs