This New England Patriots Riddell Pro-Line speed helmet has been personally hand-signed by tight end 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. If a product is unsigned or non game-used, a hologram will not be included Rob Gronkowski memorabilia. New England Patriots memorabilia