Callaway's new 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 Steelhead X-16 Pro Series Irons utilize a more blade-like design that will appeal to golfers who prefer to hit the ball lower with more shot-shaping flexibility. They have less offset, longer hosels, thinner toplines and narrower soles than their standard counterparts . Two new shaft options are available in the Steelhead X-16 Pro Series Irons. The all-new Rifle Pro Series steel shaft is available in regular, stiff and extra-stiff flexes for stability and control. The Steelhead X-16 Pro Series Irons feature a high-energy smoked finish that is durable and distinctive.