Double-sided marker creates thick or thin lines with two tip choices - broad Bullet tip for bold lines or extra-fine tip for detailed, precise lines. Perfect for color-coding and decorating planners, journals and notebooks. Create fun doodling and lettering styles with a choice of 36 colors. Water-based ink doesn't bleed through most papers. Durable fibber point tips are long lasting and maintain shape after use. Bullet tip 0. 8mm; extra-fine tip 0. 3mm.