Tombow's TwinTone Dual-Tip Markers are perfect for color-coding and decorating planners, journals and notebooks. These double-sided markers create thick or thin lines with two tip choices-broad bullet tip for bold lines or extra-fine tip for precise lines and note taking. Water-based ink does not bleed through most papers. Marker Ink Type: Permanent; Marker Tip Type: Bullet/Needle; Marker Tip Size (text): Extra-Fine/Broad; Marker Tip Size (numeric): 0.3 mm/0.8 mm.