Square-headed drivers certainly stand out from the crowd. But there's more to it than that. Manufacturers continually strive to build a better mousetrap. Current approaches for redistributing mass include newfangled geometric shapes, multi-material heads and the use of removable weights. Squarish heads are really the next logical progression (and they’re well within the Rules of Golf).

Callaway's square-headed driver

The rationale is that weight can be displaced in a square head to extreme heel and toe locations that don't even exist in traditional-shaped drivers. This creates a higher moment of inertia (MOI), which simply means the club won't twist quite so much on off-center hits. A higher MOI (in the vertical axis) serves to straighten out shots struck toward the heel or toe.

More on these clubs as additional details become available.

Rob Sauerhaft is the Managing Editor of Equipment for GOLF MAGAZINE. E-mail him your questions and comments at golfletters@golfonline.com