Putter head

1. A putter-type club head comprising:

a main body having a sole portion and composed of an aluminum alloy material and having a density ranging from 0.90 g/cm 3 to 6.0 g/cm 3 and a mass ranging from 120 grams to 150 grams;

a removable aft member having a central mass member, a heel arc arm and a toe arc arm, the central mass member having an indentation for scooping a golf ball, wherein the removable aft member is composed of a stainless steel material having a density ranging from 7.00 g/cm 3 to 10.0 g/cm 3 , and a mass ranging from 150 grams to 250 grams; and

means for removably attaching the main body to the removable aft member;

wherein the removable aft member ranges from 20 to 50 volume percent of the putter-type club head and ranges from 60 to 80 weight percent of the putter-type club head, and wherein the putter-type club head has a mass ranging from 300 grams to 400 grams;

wherein the removable aft member only contacts a sole portion of the main body.

2. A putter-type club head comprising:

a main body composed of an aluminum material having a density ranging from 2.0 g/cm 3 to 3.0 g/cm 3 , a body having a face portion, a crown portion, and a sole portion, the crown portion extending rearward from the face portion, the sole portion extending rearward from face portion, the crown portion having an alignment means, wherein the main body has a mass ranging from 120 grams to 150 grams; and

a removable aft member attached to the main body, the removable aft member having a central mass portion, a heel arc arm extending from the central mass portion toward the main body and a toe arc arm extending from the central mass member toward the main body, the central mass member having an indentation for scooping a golf ball, the removable aft member composed of a material having a density ranging from 6.0 g/cm 3 to 20.0 g/cm 3 , wherein the removable aft member has a mass ranging from 150 grams to 250 grams;

wherein the crown portion partially covers the removable aft member.