Uni Power Tank Ballpoint Pen - 0.7 mm - Blue Body - Blue Ink

I honestly believe this pen has the best refill for writing wishes on cards. Other pens, being ballpoint or fountain, don't work for me when it comes to writing on card; they either produce wider and unintresting line than on regular paper or have increased drag that inhibits writing and sometimes leads to spelling error, as pen is slower than normally. This refill (0.7 point) I find to be excellent. Writes consistently and smoothly without drag. I have also tried Tombow multipen refill and Kuretake lettering felt tip pen to write on cards but this refill beats then two.I tried many pens to write on card and only above mentioned gave me writing that did not end up in card being thrown to scrap. Card are truly different to write on (at least for me) and you need a pen that handles that well. Regular excellent writing options failed.This pen with the refill will of course write nicely on any other paper and even in extreme conditions being pressurised. Hope Uni won't stop making this. I soon be hacking to addapt this refill to fit standard rollerball pen, as I'm not a fan of plastic pens at all.