This is a Pittsburgh Steelers Flash Yellow Full Size Replica Speed Helmet that has been hand signed by Troy Polamalu. The Flash helmets are delicate and may have some marks or scratches on them. This item was inscribed "HOF 20." This item has been witnessed and certified authentic by Beckett Authentication (BAS) and comes with their tamper-proof witness sticker. Beckett Authentication has recently changed their physical certificate card policy where they no longer match their tamper-proof sticker with a physical certificate. A certificate can be printed on Beckett's website for the matching authentication number.