Sakura Knock Gel Ink Ballpoint Pen, Ball Sign Knock 04, 5 Color Assorted (GBR154-5) Sakura Knock Gel Ink Ballpoint Pen, Ball Sign Knock 04, 5 color assorted Model - GBR154-5 Knock type gel ink ballpoint pen from Japanese stationary manufacturer Sakura, 15 colors available as the series