So, what's the difference between a glass dip pen like this: https://www.amazon.com/gp/product/B0719X5MHG/ref=ox_sc_act_title_3?smid=A2MB0N7F6KWVYB&psc=1 at 7.99$ and this one... https://www.gouletpens.com/products/rohrer-klingner-glass-dip-pen-blue?variant=11884769247275 at 30.00$ (plus about 8$ shipping)? They're both made of glass...they both have high ratings, they both seem to hold a good amount of ink, etc. So, I don't understand the difference whatsoever other than how they look. Especially considering I'm going to use these for only for making ink swatches and very VERY rarely otherwise. So, once again, could anyone tell me if there are any differences between the two other than looks? And also, even if there are differences, for what I plan to do - could you guys tell me if I should just buy the cheaper one? Thanks