These various styles of push bar for your X1 and Flite Nano will allow to modify the "give" or how hard your needle hits the skin.
To adjust the give of our soft, medium and hard bars just rotate them. Each bar is at it's most rigid setting when the cutouts are facing away from the motor, and are at their softest setting when the cutouts are left/right facing across the motor.
Semi rigid, carbon rigid and stainless steel bars are not adjustable.
Consult your Flite Nano user manual for more details on how to adjust the give within each Torsion Bar.
These bars are all also compatible with the Flite V2 Combo (not including the Vice model).