All-new RTZ Wedges are made with Z-Alloy, a completely new steel formula that enables a zero-compromise design approach for incredible feel, better durability, and more consistency for Cleveland's best performing tour Wedges yet. This technology is dynamically configured by loft groupings, which helps balance spin across lofts, while maximizing spin in adverse conditions. ZipCore This low-density core technology replaces heavier material in the heel and hosel area with a lightweight, low-density, vibration-dampening material. This proprietary core allows Cleveland to shift the Center of Gravity closer to where you strike the ball, while simultaneously adding MOI.