The top string for power.
As its name suggests, this is a powerhouse!
Boosted to Elastyl, ultra elastic material, this string allows lightning acceleration.
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One more round to go to #MainDraw @zanevskamaryna & @DKasatkina @usopen. Come on you girls ! #qualies #USOpen2015 http://t.co/XF2VP1P0sX
28 Aug. - 09h58