All Evnroll putters feature Sweet Face Technology, which creates consistent distance on center and off center hits. Evnroll accomplishes this by using precise patented face milling, which imparts progressively more energy transfer on off center hits to roll the ball a consistent difference every time. The ER5 Hatchback Black is a winged mallet design with a hatched out center section. The head is made from 303 stainless steel and is CNC milled in Carlsbad California.