The Mizuno JPX-850 Driver has taken the Fast Track sliding weight system and evolved it to allow the player 10 settings to customize both spin rate and launch angle. It uses two 8-gram weight which can be located on either the central sliding rail or two lateral weight slots. It also incorporates Mizunos quick switch shaft release system allowing the player to adjust the loft of the driver from 7.5 to 11.5 degrees of loft. This driver also features piercing blue color and a compact 440cc head comes allowing the player the ability to hit it straight or shape their shots off the tee.