Najee Harris Signed Pittsburgh Steelers Lunar Speedflex Helmet FAN 42623 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is a Pittsburgh Steelers Lunar SpeedFLex Helmet that was personally autographed by Najee Harris. Includes a certificate of authenticity from Fanatics Authentication (FAN) and Denver Autographs.