Rob Gronkowski Signed Custom NE Patriots Matte Chrome SpeedFlex Helmet is a beautiful custom helmet. The helmet is signed by Rob Gronkowski, a former tight end legend and Tom Brady's favorite target, who played for the New England Patriots. The helmet is an original, custom, matte chrome SpeedFlex helmet. The authenticity of the autograph is verified by James Spence Authentication (JSA) and comes with a JSA Certificate of Authenticity.