This tennis ball has been personally hand-signed by Andy Murray. It comes with an individually numbered, tamper-evident hologram from sportsmemorabilia.com. To ensure authenticity, the hologram can be reviewed in our authenticity database. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud. SportsMemorabilia.com firmly stands behind every product offered on our site with a lifetime authenticity guarantee that each signature is 100% authentic.