Callaway's Steelhead X-16 Irons add a new 'notch' weighting design to the proven technology that has been built into previous set of Callaway irons. This locates the Center of Gravity in the ideal position to maximize efficiency and maintain distance on off-center hits. The standard Steelhead X-16 Irons have a shorter blade length and wider topline than the Steelhead X-14 Irons. A series of five new graphite shafts has also been created for the standard Steelhead X-16 Irons. The System CW graphite shafts are available in three flexes – 90 (strong), 85 (firm) and 75 (regular) – while the System UL graphite shafts are available in two flexes – 55 (light) and 47 (ladies). The RCH Pro Series M-75i graphite shafts are designed to provide steel-like performance at a lighter weight with vibration-dampening characteristics. The Steelhead X-16 Irons have soft satin finish with a contrasting, sandblasted hitting area.