Uni-ball Signo Dx Um-151 Gel Ink Pen - 0.38 Mm - 10 Pcs - Black - by Uni Mitsubishi Pencil Company black gel ink pen--0.38mm tip. Black color. Uni-ball Signo gel ink pens are known for their smooth writing and exceptional ink quality. 0.38mm tip size, carefully-formulated ink, the pigment-based ink flows smoothly and is waterproof, fade-resistant, ensures a wonderful writing experience. For any task, or writing meticulous notes, marking your calendar, etc. Delight in work, joys of writing, just enjoy it ! Uni-ball Signo gel ink pen ,the artists and writer's favourite, and it must suitable for you!