A Green Bay Packers Riddell Full Size Replica Revolution Speed Helmet hand signed by Clay Matthews. The item and signature are in excellent condition - Loved from L.A. to Lambeau, get your authentic memorabilia for one of the most dominant, electrifying defensive players in the league - AUTHENTICATION: The item is accompanied by a Radtke Sports Certificate of Authenticity, Radtke Sports Serial Numbered and Databased Hologram, and picture of Clay from the signing