Ideal for both indoor and outdoor use where permanent indelible marking is required. Quick dry, highly water and fade resistant ink. Completely opaque even on dark or transparent surfaces. The colour will remain crisp over a long period of time Fade proof. Heavily pigmented ink can be seen on dark surfaces. Permanent on most surfaces. Can withstand up to 100c temperature exposure. Bullet nib with a 2.3mm line width. Valve action for controlled ink flow. Fast drying.