Golf club head with improved striking face

A golf club head comprising:

• a striking face portion, located at a frontal portion of said golf club head, adapted to impact a golf ball;
• and
• a body portion attached to a rear of said striking face portion;
• wherein said striking face portion comprises:
• a central opening;
• a face insert to cover said central opening, wherein said face insert comprises:
• a thickened central region, located near a geometric center of said face insert, having a first thickness,
• a central transition region, extending outward radially from said thickened central region, having a variable thickness,
• a thinned intermediate region, extending outward radially from said central transition region, having a third thickness, and
• a thickened stress reducing region, extending outward radially from said thinned intermediate region, having a fourth thickness, and
• a thinned perimeter region, extending outward radially from said thickened stress reducing region, having a fifth thickness,
• wherein said thickened stress reducing region forms a horseshoe shaped ring, protruding rearward from said face insert, and
• wherein said fourth thickness is greater than said first thickness.