One of the key challenges in developing the One rollerball pens was organizing the different nib types and line widths into a clear color system. The soft component of the body features three shades of blue to distinguish the various nibs, while the hard component made from semi-transparent plastic showcases the ink color and fill level. The One Highlighter complements the series with a felt-tip and strong color contrasts. Thanks to its "remarkably smooth writing feel" and "distinctive design that sets the One apart from other products on the market," the rollerball pen was awarded the prize in the "Office Supplies" category.