Wilson says the Spine’s shape and construction delivers the maximum moment of inertia allowed under current driver regulations. The ridge running from face to back on the crown is designed to strengthen the face behind the central impact area, pushing ball speed up at impact.
Mixed office reaction to the white shaft and head shape but news of Harrington’s testing spurred me into serious hitting action – and it was well worth it. Great sound – appropriately rather than obtrusively loud – great feel and a long flight on a perfect trajectory for me. Further investigation required.