Cobra 3100 I/H Irons. The undercut design of the Cobra 3100 I/H irons pushes weight low and back for a deep CG (Centre of Gravity) and high MOI (Moment of Inertia). The result, a super-sized Sweet Zone and high launch for incredible distance and forgiveness. Aimed at lower handicappers (5+) and made from high quality 431 Stainless Steel, the Urethane insert dampens vibration for superior feel while a 'Super-sized' sweet zone across the whole club face provides exceptional forgiveness on off centre strikes.