Revolutionary to its core, the 20XI is the first 4-piece ball on Tour to use a radical new lightweight, rubber-less core (made of polymer) that makes the mantle and cover 10 percent heavier. This revolutionary RZN core delivers more distance off the tee and better control around the greens. It also features faster initial velocity for maximum distance, the highest levels of moment of inertia (MOI) for longer, more controlled shots and new construction materials giving greater consistency ball-to-ball for highly predictable performance.