At address, the ratio of aluminum to steel appears to be 50/50; in fact, steel accounts for 2/3 of the weight, created by a thick back flange, resulting in a lower, much deeper CG and a higher MOI.

Airport runway lights inspired the alignment dots in the highest-MOI model in the Heppler family. The dots get closer together front to back to simulate motion, help with eye tracking, and frame the ball. The back ballasts are cored out and steel filled in this ½ steel, ½ aluminum putter.

To elevate MOI over the Sigma 2 Fetch, which has steel bordering the center cutout, designers used aluminum here, then steel in the heel-toe ballasting for increased forgiveness. The color contrasting helps you focus on the alignment lines, causing the holed-out section to fade and not be the primary focus.