What does the value "Default" mean in Collison Presets?

If you look at Flying template, the Collison Presets setting for wall material is set to “Default”. What does this mean? Where is this default defined and is it possible to change meaning of this “Default” globally?


preset base checks for collision…
change drop down menu to custom and this will show what default is… per channel or object settings

Thanks. Now it makes sense :).