Permanent black pen, very easy to use. Does not drip and does not stain the surface. Certainly faster to use than painting on a tube. 1 gel pen replaces 4 colors in a 50 ml tube each.

• Suitable for surfaces: flat, uneven, light, dark, heated, frozen.
• Resistant to short drying time.
• High contrast - even on a dark surface.
• Use indoors and outdoors, weather-resistant, light and temperature resistant.
• Adjustable line width from 2 - 8 mm.
• Practical design that allows one-handed operation, built-in sharpener at the tip.
• High-quality smooth rotating mechanism.
• Does not contain chlorine.
• Designed for temperature identification up to 1000°C.