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Check your strings to see if they are going to break by pulling down the middle cross strings.
Look for grooves in the main strings, if they are notched your strings
are going to break soon.
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More elastic strings produce more power.
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Softer strings, strings with a softer coating and strings with a larger core tend to vibrate less and therefore provides less shock on impact.
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Thinner strings or strings with a textured coating provides more spin.
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Stiffer racquets have more power.
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A heavier racquet provides more power.
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A heavier racquet vibrates less.
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Oversize racquets have more power than their midsize companions.