Are the refills 338 also available in red and green?
No, only in blue and black with the width M and F.
Does Pelikan still produce the refill 137?
Are the refills 337 water-proof?
What does water-proof mean?
German DIN ISO Standard 12757/part 2 establishes the standards of permanence for the colour paste which can be seen on paper when held against light, for the chemical solutions and for the writing styles of the refills. Therefore, refills with a DIN symbol have high writing quality and the writing is water-proof.