Specifically formulated for cold temperatures, this marker works indoors or outdoors even when it is raining or snowing. The quick dryng formula dries permanently within 5-7 minutes. Marks may be removed from most non-porous surfaces with alcohol-based solvents and scrubbing. Marks are waterproof (except on glass) and fade-resistant. These tough markers work on almost any surface: dry, wet, dusty, rusty or rough. Users can mark at any angle, sideways or upside down with no dripping. Twist-up to advance the marker. The Solid marker is ready for immediate use and marks smoothly from the start. The 13mm tip can be trimmed with a blade.