Nike Pro Combo Oversize. Nike proprietary U/V Scoring Grooves, the perfect blend of square and angled grooves, channel water and grass away from the clubface more effectively, allowing cleaner contact and better control. Three Pro Combo Oversize designs maximize this set's performance, with Deep Undercut long irons, Full Cavity mid-irons, and Muscle-Cavity short irons. The Nike Pro Combo OS long irons are designed with a deep undercut and wide sole to position the centre of gravity lower and deeper in the clubhead to more efficiently get the ball airborne. The set's Progressive Offset reduces the risk of slicing by allowing an additional split-second to square the face in the long irons, while maintaining a high level of shot-shaping creativity in the mid and short irons. Variable sole widths are wider in the long irons for forgiveness, and reduced throughout the set to maximize versatility. Shot-makers get the advantage of Nike's two-step forging process, most-commonly used in high-end blade irons. The clubheads are precision forged to shape, then squeeze forged to align the grain. This meticulous, time-consuming process eliminates soft and hot spots, creating a much more consistent ball-striking surface than those associated with cast or faux-forged irons.