Khalil Mack, former All-Pro linebacker for the Oakland Raiders, has hand signed this white Nike Limited jersey at a private signing. Jersey is new with tags attached and all letters/numbers are sewn-on. 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 jersey. 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.