Fantastic Dual-Color Effect: Thanks to our exclusive technology, the double line outline pen can automatically produce a dual-color effect. What most surprises you is that the various pen colours you used to draw the artwork surround the metallic silver border. You can utilise it easily because of the ink's brilliant colours and distinct lines.

Varying Bright Colours: These self-outline metallic markers come in a dozen different colours. You can mark with two distinct colours on each pen. With these dual-color pens, you may illustrate the letters in various hues, making writing and sketching much more enjoyable.

Everyone is safe: The metallic markers for the double line outline pen have already been shown to be completely non-toxic and odourless, meeting safety regulations. The ultra-fine nylon tip dries quickly and doesn't fade.

 Simple to Use: Before using the outline markers, shake them thoroughly enough to mix the ink from tip to tip. After that, remove the pen cap and gently push the tip on the paper for a certain amount of time until the ink returns to the tip. Tips: Please lay the outline markers horizontally and cover them with caps immediately after usage for optimal results.