Calculated air spring.
Do you really think that a linear spring curve is only possible with a coil ?
I do not think so. The progression in the end is crucial for bottom out resistance (normaly done with a progression of the reservoir and the bottom out bumper).
The Token system. I can't call it tokens because it is a Rock Shox word. So it is not a token, it is a progression-increasing-thing -> PIT.
So I call it PIT-System
6 Orings + 1 M6 bolt on the PIT-Cap.