The Sport Information Resource Centre
Use double quotes to find documents that include the exact phrase: "aerodynamic AND testing"
The Sport Information Resource Centre

During Wimbledon, 53,000 tennis balls will be used. According to International Tennis Federation rules, every ball is hand-tested for its bounce, weight and compression, stored at 68°F, and replaced during a match after the first seven games, then every nine games. Used balls are sold, with proceeds going to the Wimbledon Foundation. Click here for more stats and facts from Wimbledon.