Callaway Diablo Edge Tour 4 Hybrid Vertical CG Optimization By using a 30% thinner crown, it allows for a lower center of gravity thats in-line with where most amateurs strike the ball on the clubface to promote high, strong trajectories that fly farther and land softer. Unique Sole Design Creates efficient impact with the face to maximize distance, consistency and accuracy from a variety of turf conditions. VFT Technology Generates high ball speeds across the entire face for hotter, more consistent distance. Offset Hosel Assists in squaring the clubface at impact while providing a look at address that boosts confidence. Tour models have less offset to enhance workability.