Callaway Tour iz Golf Balls 1 Dozen Personalized With penetrating trajectories and fast ball speed this is Callaway's longest Tour ball. It uses a Dual Core to achieve optimized performance for through the bag shot consistency. By activating a soft yet resilient inner core on drives, spin is reduced for longer shots while still delivering spin around the greens using the firmer outer core and soft urethane cover. f player, src videosflowplayerflowplayer.commercial 3.1.5.swf, cachebusting true, key '450d1f2cfdf440be091', clip url httpwww.intheholegolf.comvideoscallaway tour iz golf ballscallaway tour iz golf balls.flv, autoPlay false, autoBuffering true The Tour i z also features refined HEX Aerodynamics for reduced drag and stable, efficient ball flight in all wind conditions. Created by Nature, Perfected by Callaway Similar to honeycomb covering a beehive, Callaway's patented HEX Aerodynamics produce 100% surface area coverage on a golf ball whereas traditional round dimples typically cover only 88% of the surface. Dead space between dimples can cause inefficient flight characteristics so HEX geometries cover the entire ball to reduce drag and cut through the air with a strong, penetrating ball flight. Specifications Callaway Tour iz Golf Balls Construction 4 Piece Ball Size 1.684 Ball Target Weight 45.6 Core Material Polybutadiene Core Diameter 0.940 Outer Core Material Polybutadiene Boundary Layer Material Surlyn Boundary Layer Thickness 0.064 Cover Material Thermoset Urethane Cover Material Thickness 0.020 Cover Material Hardness 49D Surface Area Coverage 100% Aerodynamic Pattern HEX Aerodynamics Number of Geometries 332