These chainrings are brand new. They are from Campagnolo’s Centaur 10x Range.
 
Campagnolo Part Number: FC-CE036
Condition: Brand new in original packaging
 
Key Features
Box Contents: Centaur 10 speed chainring, 36T
Compatible with: Centaur 10 speed compact chainsets (should be used in combination with a 50T chainring)