Louisville Slugger Model M110 baseball bat. Hand-signed in black felt tip pen by Didi Gregorius (New York Yankees). This bat has been personally hand-signed by Didi Gregorius. 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. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.