These cleats were used and hand-signed by Corey Kluber with the inscription "2017 SPRING TRAINING USED." It has been obtained under the auspices of the MLB Authentication Program and can be verified by its numbered hologram at MLB.com. It also comes with an individual numbered, tamper-evident hologram from Fanatics Authentic. It can be verified by its numbered hologram at MLB.com. Please note that this game-used cleat may have imperfections caused by in-game play.