Maybe not so much new, new bolts, but just a drybrush of silver/Aluminum, whatever color on the edge of the bolt head. While it is fairly new, it has had time for rust to form on the center of the bolt head, but not the outside of the bolt head...or simply the bolt was taken out and put back in, a socket wrench would knock enough surface rust off the edge of the bolt head for some bare metal to show through.