International Bowling Balls

2014 Lineup


We’re all about giving bowlers everything they need to be their best. But not just in the States. We’re also gearing up our friends across the pond and worldwide with unique product offerings available only to our international customers.

Defiant Boom™

Defiant Boom™


Starting at the center, the “GUTS”, the dynamic Paragon™ core features contours designed to help expand the RG planes of the ball. This unique elliptical shape defines predictability of axis migration and allows you to perfectly match up your Defiant Boom™ to the condition at hand. Strong midlane roll and a HUGE continuous, sweeping hook on the backend! This is a big part of the HP4™ justification…it’s serious power!


Moving on to the shell, the “GRIT”, we’ve developed a new polished MicroBite™ solid coverstock that is sure to grip the lane without hooking early. Microtechnology, the use of extremely-small structured additives down to a millionth of a meter, makes this possible.


And finally, looking at the “GRIME”, the designated oil pattern and lane condition, the Defiant Boom is sure to handle heavy oil when others cannot. In order to be successful on the lanes it’s imperative that you have the proper equipment to suit. Without it, you’ll be left in the dust! Roto Grip is here to make sure YOU are the one kicking up all the dirt!

Coverstock Name MicroBite™ ™
Coverstock Style Solid
Coverstock Type Reactive
Weight Block Paragon™
Color Orange/Black/Ruby
Finish 1500-grit Polished
Finish Method Can be sanded
Durometer 73-75
Flare Potential 7+ inches/High
Weights 12lbs - 16lbs


Weight Radius of
Differential PSA Differential
16 2.49 0.052 0.017
15 2.49 0.054 0.017
14 2.52 0.053 0.016
13 2.57 0.032 0.010
12 2.59 0.029 0.008
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