Gel Ink: Gel ink allows for a smooth and smooth writing. The water-based pigments have excellent water resistance, so they do not bleed through and have vivid colors and a wide variety of colors. Binder Clip: The articulated binder clip allows you to clip on thick boards and reduce clip breakage. Wide Variety of Types: With a ball diameter of 0.01 - 0.04 inches (0.3 - 1.0 mm), it is available in all 46 ink colors, so it can be used for a variety of purposes such as notebooks, writing notes, addresses, drawing, and drawing. Ecology: Uses recycled material for the shaft and has acquired the Eco-Mark and complies with the Green Purchasing Act.