Ping Kartsen Series Craz-E putter. Ping have released the Karsten series for golfers preferring the performance of a steel face with an insert feel. An elastomer insert in the cavity provides enhanced feel while maintaining the solid response of a steel-faced putter. Weight savings from the new cavity shapes were redistributed to the perimeter to increase each putter's moment-of-inertia for added forgiveness. Multi-level alignment aids are designed into most models.