To clarify a bit on what dragonxp said, to make a material that reflects, give it a really really high StructuralIntegrity. To make something absorb/ignore wounds, you could either use Lua, or go to the INI code of the object in question and make it say like:
Code:
EntryWound = None
ExitWound = None
This will make it so that no wounds are created on the object in question, effectively rendering it immune to wounding. Make sure you replace the current "EntryWound" and "ExitWound" lines with the above, though, as i'm not sure how CC would react to two lines. Also, the three spaces are actually a tab. Very important.