This 16" x 20" photograph has been personally hand-signed by Dirk Nowitzki. It is officially licensed by the National Basketball Association 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. It measures 20" x 24" x 1" and comes ready to hang in any home or office.