Uniball Signo Standard Gel Pen 0.5mm

Brand: Uni Mitsubishi

Model Number: UM-100 Series

Ink Type: Water-based pigment gel ink (

Nib Size: 0.5mm

Functionality: Smooth, consistent ink flow, ultra-durable stainless steel tip, classic crystal-clear barrel with visible ink supply, and a lightweight capped design with color-coded accents

Best For: Classic daily writing, note taking signing documents

The Uni-ball Signo UM-100 is the iconic, original gel pen that set the benchmark for smooth gel writing. Known for its distinct clear hexagonal-feel barrel and vibrant pigment ink, it delivers bold, crisp lines that stay permanent, waterproof, and lightfast once dry. Whether in standard writing colors or shimmering metallic tones, the UM-100 offers a timeless, scratch-free writing experience that glides effortlessly across notebook pages, making it a reliable favorite for students, professionals, and artists alike.