Staedtler color pens set | Some FAQ’s about the product
1) Are Staedtler Fineliner pens waterproof?
A) Staedtler Triplus Fineliners have water-based ink that can be washed out of many types of fabric which means they are not waterproof or water-resistant. The pens are not refillable. They are airplane safe: automatic pressure equalization prevents the?pens?from leaking on board aircraft.