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In 2007 Mizuno introduced a sliding weight system called Fast Track to alter a driver's draw/fade tendency. Mizuno has now evolved this breakthrough technology to also be able to customize spin rate and launch angle in the Lady JPX-850 Driver, helping all swing speeds achieve maximum possible total yardage. The piercing blue Lady JPX-850, first seen on Tour in April 2014, uses twin 8-gram weights which can be located on either the central sliding rail, or two lateral slots. With ten unique settings, players of all head speeds can dial in their perfect launch and spin. [+]