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Melbourne, Australia, 2015, May 9: String bed stiffness of a Tennis tour player frame is measured on strings. The measurement is used to check the qua Stock Photo - Alamy
S&S Worldwide Aluminum Tennis Racket. Mid-sized 90 Square Inch Head. Modern I-Beam Aluminum Cross Section Design for Added Stiffness and Power. Adult Size, 27" L with 4-3/8" Grip. - Walmart.com
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