This is a pair of two piece rear rotors for a C5 Racing Corvette.  Not long after I switched to two piece rear rotors for weight savings, I decided to upgrade the rear brakes to Wilwood racing brakes on the rear, so I cannot use these rotors.  Lots of life left on these.  These are $750 for a pair new.  Once you buy a set, you can just replace the outer ring section instead of the whole rotor.  The hat can be reused multiple times.