MONO Twin Extra Fine E Oil-Based Marking Pen / Tombow

• Tip Type: Twin (fine + ultra-fine)
• Fine Tip Line Width: 0.8mm
• Ultra-Fine Tip Line Width: 0.4mm
• Ink Type: Oil-based dye ink
• Compatible Surfaces: Paper, metal, plastic, glass, poly bags, ceramics, leather, wood
• Body Material: Recycled plastic (70% or more, excluding ink)
• Eco Certifications: Eco Mark certified, Green Purchasing Law compliant, GPN Eco Product listed
• Colors Available: Black, Red, Blue

The MONO Twin addresses a common marker frustration: needing two separate pens when a single job calls for both detail work and broader lines. By placing a 0.4mm ultra-fine tip and a 0.8mm fine tip at opposite ends of one barrel, Tombow halves the tools you need to carry without sacrificing either line weight.

The oil-based dye ink formula is the key to its surface range. Unlike water-based inks that bead or fade on non-porous materials, the oil-based formula bonds to metal, glass, ceramics, plastic, and leather in addition to standard paper. This makes it as useful in a workshop or studio as it is at a desk.

The body itself is built from 70% or more recycled plastic content, earning Eco Mark certification and compliance with Japan's Green Purchasing Law. The environmental credentials come from material choices at the manufacturing stage rather than from marketing claims.