pens we like

Faber-Castell Pitt Pen

can you translate Starbucks sizes?

what I really need is an ink that does not move after it is dry. it needs to be acid free. and come in all the sizes from tiny to fat. these pens are all that. except they use a letter to indicate size. why is M bigger than F when F could mean Fat and M could means More. S comes later in the alphabet but in this case it means Small. and XS does not mean EXCESS. it means Extra Small. speaking of small, who wants to get SMALL? if you get Pitt pens you will need to get used to the letters.  BTW, how do you say Extra Small in Starbucks?

measured in letters. S= 0.3mm, F= 0.55mm, M= 0.7mm, B= brush width