To hit a tennis ball with power and precision, contact must be at the "sweet spot," at the center of the racket, where the strings are most responsive. The Prince 03 expands that spot by up to 54 percent by replacing pin-size string holes with half-inch-wide "ports" that allow the strings more room to move upon impact.
$220â€$300
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Inside NASA's astronaut bootcamp and the grueling new training regimen for deep space. Plus, ten young geniuses shaking up science today, one writer's quest to analyze every man-made chemical in her body and more.
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