Are these pens waterproof on all paper types?
They are waterproof on most papers, including sketch, marker and mixed-media paper. On glossy or coated paper the ink may take longer to dry.
Are the fineline and calligraphy nibs suitable for detailed illustration?
The eight fineline nibs range from 0.03 to 0.8 and are designed for precise detailing, while the four calligraphy nibs provide stable, controlled line variation.
Are the materials safe for everyday use?
The pens are non-toxic, made from recycled PP and designed for long-lasting, low-impact use.