what does the ball.cfg , fast.cfg......etc

[abu]

what does the FAST.CFG,SWING,CFG,OFFSPIN,CFG...ETC and most importantly BALL.CFG change in the game........

plz tell what does all these thing change in different files mentioned above...

this is an example.....

RestitutionXZ 0.875000
RestitutionY 0.405991
RollingResistance 0.987289
WicketRestitutionXZ 0.999999
WicketRestitutionY 0.629288
WicketRollingResistance 0.987198
Gravity 0.108948

PLZ HELP ME COZ IT SURELY HELP ME IN MAKING MY GAMEPLAY PATCH BETTER