The new Mondeo 811 is a hollow body, multi-material, two-piece construction.
Insert Face: The thin face is made from heat treated, high strength 450 Maraging Steel to offer a higher COR. The face is only 2.0 to 2.1 mm thin, the unsupported, thin face increases face flexing. The thinner face increases ball speed and improves weight distribution for a low and deep Center of Gravity. Read More: - https://blog.monarkgolf.com/just-arrived-mondeo-811-hollow-core-iron-with-maraging-insert-face/