Golf club head with pixellated substrate

A golf club head comprising:

• a body having a front face, a rear surface and a cavity extending from said front face toward said rear surface, said cavity having a central region, a perimeter region and a bottom surface;
• a face insert disposed in the cavity, said face insert having a front surface and a back surface, said front surface forming a striking surface on the front face of said body;
• and
• a substrate disposed in said cavity sandwiched between the back surface of said face insert and the bottom surface of said cavity, said substrate including a plurality of elongate rod elements each having a first end, a second end and a side surface, said plurality of elongate rod elements arranged in a parallel closely packed array such that the side surface of each of said plurality of elongate rod elements is in contact with the side surface of an adjacent one of said plurality of elongate rod elements, with the first ends of said plurality of elongate rod elements facing said bottom surface and said second ends of said plurality of elongate rod elements supporting at least a portion of the back surface of said face insert, wherein said elongate rod elements are selected to provide greater resiliency proximal said central region and a lower resiliency proximal said perimeter region.