The standard model a 440cc Size and a great shape with square face angle that produces great ball speeds and is super forgiving for a small head.
From the manufacturer
The G400 drivers' streamlined shape offers a big advancement in aerodynamics and stability. The multi-material design combines reduced drag and a thinner, stronger, faster T9S+ forged face to increase speed and distance. With a combined MOI over 9,000 and a deep CG, improved accuracy leads to tighter dispersion.
Faster Forged Face
The forged T9S+ face increases flexing to produce hotter ball speeds with a powerful sound and feel. With a combined MOI over 9,000 and a deep CG, improved accuracy leads to tighter dispersion.
Tungsten Back Weight
A higher-density back weight creates extreme MOI to elevate forgiveness and accuracy while allowing you to customize your swing weight. You can fine-tune launch conditions by adjusting loft up to +-1º.
In addition to improving feel, the internal rib structure of the G400 head rewards you with a rich, full sound at impact. Bolder crown turbulators enhance clubhead speed and visual appeal.
Streamlined shaping harmonizes with bolder turbulators and Vortec Technology to reduce drag 40% mid-downswing and 15% overall to increase clubhead speed and ball velocity for added distance with stability.
Dragonfly Technology creates an ultra-thin crown and skirt for weight savings to optimize the CG location and dramatically increase MOI for greater forgiveness and accuracy.
The bolder turbulators facilitate faster clubhead speed and help focus your eye for confidence. Dragonfly Technology extends to the skirt, creating an “infinity edge” effect that adds to the inspiring look.