Stic Pens Ltd manufactures Gel Pen with 0.5 mm Tungsten Carbide Ball. Stic Pens Ltd also manufactures various types of ball pens, fine-liners, sketch pens, markers, hi-lighters etc. The Gel Pen with 0.5 mm Tungsten Carbide Ball, also known as Duplex Gel Pen, has specially formulated writing system for smooth, vivid and goop-free writing. The Gel Pen with 0.5 mm Tungsten Carbide Ball has Japanese water-proof ink to protect documents from water spills. This Gel Pen has ergonomically designed rubber grip for fatigue-free writing. This Gel Pen is refillable and is available in blue, black and red ink colour.