DetailsA Minnesota Vikings Full Size Replica Speed Helmet hand signed by Dalvin Cook. The item and signature are in excellent condition. Dalvin is a running back for the Minnesota Vikings. AUTHENTICATION: The item is accompanied by a JSA Certificate of Authenticity - JSA Serial Numbered and Databased Hologram- ANY QUESTIONS CALL 1-770-945-6945 *** Radtke Sports uses professional lighting for our product images that may show reflections. We also feature watermarks on our proof pictures.