Hakeem Olajuwon and Clyde Drexler, former All-Americans for the Houston Cougars, have each hand signed this 16x20 photo. 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 photo. 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.