This breastplate or prosternidion depicts a four-horse chariot seen from the front, flanked by flying, winged figures of Nike, the goddess of victory, holding crowns. This image of a chariot flanked by Nikai usually appears in Greek art in connection with victory in a chariot race. This elaborate armor probably had a ceremonial purpose, perhaps serving as a prize for a victorious chariot team.
The small holes running around the edge of the breastplate allowed a leather backing to be sewn onto the bronze for cushioning; the larger holes at the ends were used to attach a fastening strap.