The face insert features variable-depth grooves. The grooves are deepest in the center, and get gradually shallower out to the perimeter. The result is consistent, predictable distances on your putts, even if you strike the ball closer toward the heel or toe. The insert is made from a lightweight 6061 aerospace-grade aluminum that provides a crisp feel and sound similar to a traditional steel face. Perimeter weighting creates a high MOI to elevate forgiveness and help keep putts on target. Serene models are part of our Fit for Stroke™ concept and are available in straight and slight arc stroke types. Choose from the Anser 2, B60, Craz-E Too, and Shea models to match your stroke type and style preference.