Photo measures 8" x 10" in size and has been hand-signed in black felt tip pen by Dalvin Cook. The autograph includes an official James Spence Authentication (JSA) "Signature Debut" hologram. "Signature Debut" is the autographed memorabilia equivalent to a rookie card. The JSA definition of a "Signature Debut" is as follows: "Any item that is autographed and received by JSA prior to the last game of the signer's official rookie season.Authentication: JSA "Signature Debut" Hologram