Yonex z force driver yonex have placed the centre of gravity lower and deeper within the club making the z force easier to hit and more forgiving on off centre hits the yonex have reduced the weight in the top of the club by 3 grams utilising their octaforce crown design this proprietory construction method makes the club lighter which in turn increases club head speed resulting in greater distance lower moi promotes a higher ball launch and helps the z force to be the most forgiving driv