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Old 01-31-2013, 06:53 AM   #2
RD 7
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Join Date: Feb 2009
Posts: 122
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http://www.yonex.com/tennis/vcore/technology/

From Yonex website
The VCORE Xi delivers an expanded sweet spot, for greater levels of response and control, normally found in larger, more difficult to handle, racquets. Featuring YONEX's unique Extra ISOMETRIC head shape, the VCORE Xi's frame is combined with higher density urethane 'MICRO CORE' to allow you strike the ball with a devastating level of spin a vital element for any player to remain on the offensive.
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