Callaway HX Diablo Golf Balls 1 Dozen The Callaway HX Diablo Golf Ball is a 2 piece ball that combines incredible distance with unbelievably soft feel. The secret is a proprietary core thats highly resilient, but features an ultra low compression. This produces high ball speeds for long distance off the tee, but the soft feel off the clubface that many golfers prefer. The thin Ionomer cover helps keep driver spin low to maximize more accurate distance and HEX Aerodynamics reduces drag and promotes a stronger ball flight. Proprietary Core High resiliency at a very soft compression to increase ball velocity for long distance while maintaining incredibly soft feel. Thin Ionomer Cover Promotes optimal, low driver spin for sinfully long drives. HEX Aerodynamics Replaces conventional dimples to reduce drag and produce a more penetrating ball flight in various weather conditions.