The Callaway Tour i golf ball is the most technologically advanced tour ball ever developed - incorporating perimeter weighting to increase the ball's MOI. Innovative 4-piece inertia technology utilizes a tungsten-infused outer core to shift weight away from the center of the ball, reducing driver spin for maximum distance and straighter shots, and a softer inner core for unparalleled tour feel. The softer urethane cover generates more short-game spin for precision control and aggressive shot-making and refined HEX Aerodynamics further increase distance by reducing drag.