Hello. I was searching for info on this pen before buying, anyone got any info on even the tips used in this set? Link to Amazon: http://www.amazon.com/Lanxivi®-Fountain-Interchangeable-Calligraphy-Leather/dp/B00WRAZEQ6/ref=sr_1_97?ie=UTF8&qid=1445609770&sr=8-97-spons&keywords=Fountain+pen+flex+nib&psc=1