This item comes with a Certificate of Authenticity along with matching tamperproof holograms from Autograph Warehouse guaranteeing the authenticity of this handsigned autograph Autograph Warehouse stakes its reputation on every item it sells and authenticity is their number one priority Each and every autograph is guaranteed for life to be authentic Features. Arizona Diamondbacks Ft 2004 Donruss Studio 12 Robby Hammock Autographed Baseball CardSpecifications. Weight 1 lbs