Riddell Full Size Replica Speed Helmet hand signed by Green Bay Packers Super Bowl XLV Champ CLAY MATTHEWS. The signature is in Black Paint Pen with the inscription "GBP SACK LEADER 83.5". This item was signed at a private signing and would make a great addition to any Packers collection! This item is guaranteed to be 100% authentic and will include a COA hologram from Beckett Authentication.