This authentic NFL Riddell Oakland Raiders mini helmet has been beautifully hand-signed by All Pro Khalil Mack and comes with a RARE Certificate of authenticity from PSA DNA and matching hologram sticker!! Helmet is in PRISTINE condition and the signature is FLAWLESS! The item "Khalil Mack Signed Authentic NFL Helmet Raiders RARE PSA DNA COA and Hologram" is in sale since Saturday, February 29, 2020. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Football-NFL\Helmets". The seller is "jsinkew" and is located in Westerville, Ohio.This item can be shipped to United States.