uni mitsubishi pencil Uni‑Ball Paint PX‑21 black oil‑based marker pen, length 133 mm, single pack

uni mitsubishi pencil Uni‑Ball Paint PX‑21 black oil‑based marker pen is a single black marker designed for durable, opaque marking on a wide range of surfaces. The pen comes in a white barrel with a compact 11 × 11 mm body and measures 133 mm in length. It uses oil‑based, waterproof paint ink that is silicone‑free and intended for applications requiring a permanent, clearly defined black line.

Advantages

The oil‑based formulation provides strong, opaque coverage that adheres to paper, glass, metal, plastic, wood, fabric and stone. Its 1.2 mm nib produces a defined, consistent stroke suitable for writing, marking and decorative work. The silicone‑free ink reduces the risk of contamination on sensitive surfaces, while the marker’s water‑resistant and fade‑resistant properties help maintain legibility and appearance over time.

Suitable for

• Writing and labeling on paper and cardboard
• Marking on non‑porous surfaces such as glass, metal and plastic
• Decorative details on wood, fabric and stone
• Art projects, signage and craft work requiring opaque black ink

Key specifications

• Ink type: oil‑based paint, black
• Nib width: approximately 1.2 mm
• Barrel colour: white
• Body dimensions: 11 × 11 mm
• Overall length: 133 mm
• Pack size: single pen
• Silicone‑free formulation
• Water‑resistant and fade‑resistant ink

How to use

Shake the marker well before use to mix the oil‑based ink. Press the nib gently on a scrap surface to start ink flow if necessary, then write or draw with steady pressure to achieve a uniform line. For marking on smooth or non‑porous surfaces, allow additional drying time to ensure the paint sets; on porous materials, multiple passes may increase opacity. Recap the pen after use to prevent the nib from drying out.

Usage recommendations

Use on clean, dry surfaces for best adhesion. Test the marker on an inconspicuous area when working with sensitive materials or fabrics. Store horizontally or with the cap secured to maintain ink flow and prevent leakage.