FINE METALLIC COLOR - Contain shimmering ink, finely ground particles, which yield a smooth, even sheen, for your creat your craft a beautiful greeting card or add luster to an illustration. COLORS FLOW NICE & SMOOTH - Writes very smoothly and glide effortlessly across the page, no gaps or bubbles in the ink. COMFORT & SAFE - Contain small, finely ground particles, with water-based ink, acid-free, environmental and non-toxic which ensures comfort even when you work with them for a long time. These metallic pens are opaque, meaning they completely cover the underlying surface. Opaque inks contrast well with colored and dark papers. Also show up well on metal, glass, plastic, and many other surfaces.