This guitar has been personally hand-signed by Rob Gronkowski. It is officially licensed by the National Football League and comes with an individually numbered, tamper-evident hologram from Fanatics Authentic. To ensure authenticity, the hologram can be reviewed online. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud. This Adrian Peterson product is guaranteed authentic and includes a Fanatics Certificate of Authenticity and an accompanying tamper-evident Fanatics Hologram.