Schneider Rediform One Business Rollerball, 0.6 mm Pen Point Size, Black, 10/Pack (RED183001) Pack of 10The One Business Rollerball features an ultra smooth, 0. 6mm tip to give you an incredibly smooth writing experience. The innovative, Super Flow system provides consistent ink flow from start to finish to make sure every drop is used. The large ink reservoir has a level indicator to prevent unexpected runout. Cap off, waterproof ink does not run dry even if the cap is removed for two to three days. Rubberized grip zone provides a secure hold for