Nike GL0655-701 RZN Black is now softer for better feel and reduced excess spin. The RZN core combined with RZN mantle layer delivers faster speed through the bag with exceptional feel. Lighter RZN core and heavier outer layers results in the highest levels of MOI for more stable ball flight, especially in crosswinds. RZN is 10 percent lighter than conventional rubber. There is increased greenside spin and control. Distance oriented with 4 piece urethane. It is a faster ball speed for longer distance. Lower spin for more penetrating flight.