MFG Crosswing pedals feature Exchangeable centering system with various "CAM " profiles
CAM centering profiles have influence on progressivenes of force increase when deflecting rudder axis as well as center notch. That allow fine tuning the feel to reflect realistic forces of different aircrafts.
2x CAM's come standard with pedals ( CAM4 & CAM6 )
you can purchase extra CAM5 here
Detailed explanation on difference among CAM profiles here in PDF file