Created using a new DualCore - with a softer core to enhance feel and a firmer, more resilient outer core that allows for greater energy transfer. The RB MAX also features Mizuno’s AXIALFLOW dimple to reduce drag – for improved distance and penetration through the wind. Suitable for medium to high swing speeds. 336 AXIALFLOW dimple: Same dimple design used on Mizuno tour balls. Dual Construction Butadiene Rubber Core: With its softer inner core and firmer outer, RB Max can produce fast ball speeds with a fantastic feel from full shots. Ionomer cover for a blend of greenside feel and year-round durability.