C523 IRONS High-grade TPU VIBRCOR Technology strategically placed in the deep undercut pocket to create a new speed-inducing and feel-enhancing internal technology. VIBRCOR creates a distinct feel of the clubhead at impact that dampens sound and shock, while also creating perimeter weighting around the entire clubhead for maximum forgiveness and power and ball speed enhancement off the face. Features a more compact design, a thinner topline and a sharper high toe that promotes myriad game-improvement benefits in a classic iron. The more compact design of the C523 Iron has removed weight from the top line to create an ultra-low CG. The ultra-low CG placement promotes a high launch, stability at impact and added forgiveness on off-center hits. A wide sole of the C523 Iron and its deep 360-degree undercut cavity is optimized for playability, turf interaction and ease of launch. Offers superior bounce and increases launch for cleaner, high-flying shots and leads to cleaner turf interaction for more consistent shot making The 360° undercut cavity creates more face flexing and faster ball speed across the entire face. Advanced toe weighting has been strategically increased and made more visible in the new C523 Iron design. This added toe weighting maximizes stability on impact and provides better off-center hit distance from the face of the iron and elongates the sweet spot and creates a pure feel off the face of the irons. The lower and deeper CG allowed the C523 irons to be power lofted to create an extreme distance iron. Power lofting in this forgiving iron design promotes both distance & optimized height that achieves maximum distance without sacrificing the peak apex trajectory.