Has been popular in Europe for long. Without deterioration Can be left open for 4 hours. Imported from Germany Yellow ink Diameter of 2-5 mm. (Depending on the degree of this writing). Stabilo Neon Highlighter sets have a chisel-tip nib that allows for various line widths from a single tip. Vibrant, water-based ink is suitable for paper, copy, or faxes. The tube shaped body prevents the marker from rolling away or out of reach and is reminiscent of holding a paint tube. Refillable.