The Wacom Pro Pen 2 is an INCREDIBLE pen. Despite the existence of the Pro Pen 3, I think the Pro Pen 2 is better. This is the standard against which I judge all other pens.
It supports 8192 levels of pressure
Like other Wacom pro pens it has an very low IAF of <1gf.
As of May 2024 it has the highest maximum pressure in the industry of almost 800gf.
Two buttons
Eraser
It is an expensive pen at about $90. So it is more expensive than some pen tablets themselves.