Marvelous TWINKLING ink-colors with 1.0mm ball. Gelly Roll Pens are great for journaling, doodling, crafting, illustration and much more. These pens glide smoothly, won't bleed or blot and dry to be waterproof and fade-resistant. Meets ASTM and ACMI non-toxicity standards and is AP seal certified. 0.5mm line width.