(a) a first contact surface, wherein the first contact surface is partially-cylindrical and further comprises

a first radius,

wherein the first radius is at least the same measurement as a golf ball radius,

a first perimeter edge,

a second perimeter edge,

a first apex, and

a first depth,

wherein the first depth is defined as a distance between the first apex and a first plane defined by the first perimeter edge and the second perimeter edge, and

wherein the first depth is at least one-half the radius of a golf ball;

(b) a rear wall, the rear wall being opposite the first contact surface wherein the rear wall comprises a second contact surface, wherein the second contact surface is concave and further comprises

a second radius, wherein the second radius is at least the same measurement as a golf ball radius,

a third perimeter edge,

a fourth perimeter edge,

a second apex, and

a second depth, wherein the second depth is defined as a distance between the second apex and a second plane defined by the third perimeter edge and the fourth perimeter edge, and

wherein the second depth is at least one-half the radius of a golf ball;

(c) a top surface, the shaft being connected to the putting head at the top surface, the top surface being connected to the first contact surface and to the rear wall; and

(d) a sole, the sole being opposite the top surface, the sole being connected to the first contact surface and to the rear wall;

(e) wherein the distance between the top surface and the sole is at least one-half the radius of a golf ball.