Reddit mentions of Black Ceramic Fine Slim Rollerball Pen by Ohto

I bought my Ohto Orca about 7 years ago, I think they're out of production now. Given that you like a weightier pen body, you might not actually like the Orca very much, it's one of the lightest rollerballs I have. The Ohto FINE uses the same ceramic rollerball refill and has a much nicer weight and balance. Looks like that one is still available on Amazon, but out of stock at JetPens, where I originally bought mine.

If your heart isn't set on an Ohto pen, Retro 51's standard pen body is heavy (28g vs the Orca's 20g) and well-made, and I personally like the design aesthetics (while recognizing that everybody's taste is different).

Edit: corrected weight