Mike, that is
Apple PowerMac G5 Install Discs, machine specific gray discs.
Version: Mac OS 10.3.5, Disc Version 1.1, 691-5202-A
Notes: Two disc set originally included with Apple PowerMac G5.
If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
How to find the serial number of your Apple hardware product...