845-MAX HYBRID: FLEX-11 face design features 11 different face thicknesses to produce faster ball speeds on off-center hits Face progressively thins out from 2.2mm in the center to 2.0mm, 1.8mm, 1.6mm and 1.4mm Improved Inertia Technology(TM) features a new head shape and a super thin stainless steel cast body to boost Moment of Inertia High M.O.I reduces twisting on off-center hits for more forgiveness