High-quality twin-tip calligraphy marker pen with a broad 5.0mm tip plus fine 2.0mm tip that creates a wide range of effects. Water-based pigment ink is light-fast, waterproof, acid-free, archival quality - suitable for all art, craft and scrapbooking uses. Darker colours can be transferred to lighter colours by holding the tips together, which can then create interesting blended 2-colour effects.  .