Use this fineliner from Staedtler for writing, drawing and sketching purposes. Its ink is waterproof on paper, and also erasable on drafting paper. This pen can be left uncapped for up to 12 hours without drying up. Details: Black inkAvailable in multiple sizes Long, metal tip Lightfast and waterproof on paper Erasable when used on drafting paper No bleeding when highlighted Can be left uncapped for up to 12 hours without drying up Airplane safe AP certified Conforms to ASTM D-4236