This product is a signed tennis ball by Serena Williams, a legendary figure in the world of tennis. The COA (Certificate of Authenticity) adds an extra layer of verification to ensure the authenticity of the signature. The ball belongs to the 2000s period and is a must-have for any avid tennis fan or collector looking to own a piece of sports history. Autographed tennis balls from renowned players like Serena Williams hold value not only due to the signature but also as a memorable piece of sporting memorabilia.