(Style Fit) Choose from a variety of refills x select holder; Ink: Gel ink/uni-ball signo; Ball diameter: 0.01 inch (0.28 mm); Feature 1: Choose from gel ink ballpoint pen (uni-ball signo), oil ball point pen (jet stream), sharp (nano dia); *This product is a gel ink ballpoint pen feature 2 / Choose from a wide variety of holder: Single color, 3 color, 5 colors, knock type and rotating. Shape, carry as a spare Convenient