The Servers to associate with the Stamp. Do not specify any value for this parameter if you wish to leave the Servers associated ...

The Servers to associate with the Stamp.  Do not specify any value for this parameter if you wish to leave the Servers associated with this Stamp unmodified.  Specify an empty collection if you wish to not associate any Servers with this Stamp.  Otherwise, specify the collection of Servers to associate with this Stamp.