Kwon Alexander, star linebacker for the San Francisco 49ers, has hand signed this 49ers Riddell Speed full-size authentic helmet at a private signing. This helmet is fully padded inside like the ones worn on the field. This item comes with a certificate of authenticity (COA) from JSA - James Spence Authentication 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.