This is a very nicely balanced pen and looks very cool. I was able to get a Pentel rollerball refill in it but only after employing the laws of thermal expansion and taking a torch to the nib to expand it just enough to fit. Not a huge deal breaker but still a slight inconvenience for what would otherwise be a perfect writing instrument. I've seen other copper pens going for around $100, so I'll give it 4 stars for the excellent price, balance, but seriously, use an international size nib.