This Oklahoma Riddell full-size authentic helmet has been hand signed by 5 Oklahoma Heisman Trophy winners; Baker Mayfield, Kyler Murray, Billy Sims, Jason White and Steve Owens. Each player included his Heisman inscription. This helmet is fully padded inside like the ones worn on the field. This item comes with a certificate of authenticity (COA) from Beckett Authentication Services and was signed in the presence of one of their representatives. You will receive a serial-numbered COA along with a matching serial-numbered sticker on the helmet. The authenticity can be verified online by entering the serial number.Item pictured may not be the exact item you will receive. It will be similar quality, and we guarantee your satisfaction.