Golf club head

1. A golf club putter head, comprising:

a club body including a front portion, a rear portion, a toe portion, a heel portion, and a central portion, the central portion connected with the front portion and extending primarily in an XY-plane toward the rear portion;

the club body further comprising a club body frame and a rim having a peripheral contour, wherein a substantial portion of the central portion is contained within the rim across the XY-plane; and

a lightweight crown being located within the central portion and attached to the club body frame, the lightweight crown being located above an offset plane, the offset plane being located at 2 mm above a horizontal origin XY-plane when the club head is in a square lofted position at address, wherein the lightweight crown includes a recess for receiving a fastening member to attach the lightweight crown portion to the club body frame.

2. The golf club head of claim 1 , wherein the lightweight crown is comprised of an injection molded material.

3. The golf club head of claim 2 , wherein the lightweight crown includes a polymer material.

4. The golf club head of claim 3 , wherein the lightweight crown weighs between about 5 g and about 35 g.

5. The golf club head of claim 2 , wherein the lightweight crown includes a plate attached to a top surface of the lightweight crown.

6. The golf club head of claim 1 , wherein a plate is attached to a top surface of the lightweight crown to cover the recess.

7. The golf club head of claim 6 , wherein the plate weighs between about 3 g and about 10 g.

8. The golf club head of claim 2 , wherein the moment inertia of the club head about a CG x-axis is between about 1,000 g·m 2 and about 10,000 g·cm 2 .

9. The golf club head of claim 2 , wherein the moment of inertia of the club head about a CG z-axis is between about 2,000 g·cm 2 and about 14,000 g·cm 2 .

10. The golf club head of claim 2 , wherein the moment of inertia of the club head about a CG y-axis is between about 1,000 g·cm 2 and about 10,000 g·cm 2 .

11. The golf club head of claim 2 , wherein the CGx location is between about −5.0 mm and about 5.0 mm, the CGy location is between about 30 mm and about 50 mm and the CGz location is between about 9 mm and about 15 mm.

12. The golf club head of claim 2 , wherein the inner portion weight ratio is between about 0.15 and about 0.25.

13. The golf club head of claim 2 , wherein the footprint ratio is between about 0.70 and about 0.90.

14. The golf club head of claim 2 , wherein the total weight of the club head is between about 300 g and about 400 g.

15. The golf club head of claim 2 , wherein the effective footprint is between about 8,000 mm 2 and about 10,000 mm 2 .

16. The golf club head of claim 2 , wherein the actual footprint is between about 6,000 mm 2 and about 8,500 mm 2 .

17. A golf club putter head, comprising:

a club body including a front portion, a rear portion, a toe portion, a heel portion, and a central portion, the central portion connected with the front portion and extending primarily in an XY-plane toward the rear portion;

the club body further comprising a club body frame and a rim having a peripheral contour, wherein a substantial portion of the central portion is contained within the rim across the XY-plane;

a lightweight crown being located within the central portion and attached to the club body frame, the lightweight crown being located above an offset plane, the offset plane being located at 2 mm above a horizontal origin XY-plane when the club head is in a square lofted position at address; and

a plate attached to a top surface of the lightweight crown.

18. The golf club head of claim 17 , wherein the lightweight crown is comprised of an injection molded material.

19. The golf club head of claim 18 , wherein the lightweight crown includes a polymer material.

20. The golf club head of claim 19 , wherein the lightweight crown weighs between about 5 g and about 35 g.