This basketball has been personally hand-signed by New York Knicks' great John Starks.The signature on this item has been authenticated by Steiner Sports and features a uniquely numbered tamper proof hologram which can be verified in our online database. This process ensures your item is authentic and prevents duplication and fraud100% Guaranteed AuthenticIncludes Steiner Sports Certificate of AuthenticityFeatures Tamper-Evident Steiner Hologram