uni-ball Signo RT UMN-155 Retractable Gel Pen 0.5mm 3-Pack (Black / Blue / Red)

uni-ball Signo RT UMN-155 Retractable Gel Pen — Japan | 0.5mm | 3-Pack

Some pens just write better. The uni-ball Signo RT UMN-155 is a Japanese icon — a retractable gel pen trusted by students, professionals, and stationery enthusiasts worldwide for its ultra-smooth ink flow, crisp 0.5mm line, and satisfying click mechanism. This 3-pack gives you the three essential ink colors — Black, Blue, and Red — ready for notes, annotations, corrections, and everything in between.

Key Features

• Brand: uni-ball (Mitsubishi Pencil, Japan) — world-renowned Japanese writing instrument engineering
• Model: Signo RT UMN-155
• Tip Size: 0.5mm — fine, precise lines for clean handwriting and detailed note-taking
• Mechanism: Retractable click — one-handed operation, no cap to lose
• Ink: Signo gel ink — smooth, consistent flow with quick-dry, smear-resistant performance
• Colors: Black / Blue / Red (one per pack)
• Pack Contents: 3 pens (1× Black + 1× Blue + 1× Red)

Why You'll Love It

There’s a reason the UMN-155 has been a bestseller in Japan for years. The moment the gel ink touches paper, it flows without skipping, without blobbing, without effort. The 0.5mm tip is fine enough for small handwriting but bold enough to read at a glance. Click it open, write, click it closed — a ritual so smooth it becomes second nature. Three colors, one set, every writing task covered.

Specifications

• Brand: uni-ball (Mitsubishi Pencil)
• Model: Signo RT UMN-155
• Origin: Japan
• Tip Size: 0.5mm
• Ink Type: Signo gel ink — quick-dry, smear-resistant
• Mechanism: Retractable click
• Ink Colors: Black, Blue, Red
• Pack Quantity: 3 pens

Perfect For

• Students — class notes, exams, and assignments
• Office & professional use — documents, signatures, annotations
• Color-coded note-taking & study systems
• Journaling & planner writing
• Gifting — a classic Japanese pen set for any writer