Pilot Japan has five Yawaragi (literally translated as being softened color) colors in their extensive Hi-Tec-C line. These beautiful, fine gel pens write in pastel colors with the same smoothness at the rest of the line. Great for works that need a lighter color touch.
Current Yawaragi colors include: Usuzumi (Light Sumi Gray), and Kurikawa (Chestnut Bark Brown) only. Other colors have been discontinued by Pilot.