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 Evnroll ER1TS is an extreme offset flange blade with an amazing 20,000 effective MOI. The ER1TS's head is made from 303 stainless steel and is CNC milled in Carlsbad California.