Ystudio Classic Revolve Rollerball
Excellent snap cap metal pens. The capping feeling is especially satisfying. Cap doesn’t post. A coin is needed to unscrew the back plug to swap refills. Grip is on the narrow side but I find it comfortable.
Variants: Raw brass and black painted versions.
Refill: Euro-type rollerball. Pentel EnerGel can also be hacked in.