Most noticeably, the dual-durometer face inserts use shallow grooves to produce consistent speeds across the face.
Also, the face inserts use a special weight-saving Pebax elastomer that provides a soft feel and greater feedback for the player. The saved weight allowed Ping to make other areas of the putter head heavier in order to boost forgiveness on mishits. For example, high-density tungsten weights have been placed in the heel and toe sections to increase MOI (moment of inertia, a measure of forgiveness).