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Outer shell of the ball
Prime Response
Surface texture on the ball (sanded, polished, etc)
500, 2000 Siaair Micro Pad
Lane Condition
Length and/or amount of oil on the lane
Medium to heavy oil
Color of the ball
Black / Grey Solid
Available weights
16-12 LBS
Weight block inside the ball
Core Type
Basic shape type of the core (Symmetric, Asymmetrical, Pancake)
Radius of Gyration: measurement related to weight distribution of the core. This affects how quickly a ball will get in to a roll. A ball with a higher RG will roll later. A ball with lower RG will roll sooner.
16 LB. - 2.506
15 LB. - 2.519
14 LB. - 2.538
13 LB. - 2.589
12 LB. - 2.612
Difference between the RG of the core's x-axis and y-axis. Indicates track flare potential and stability. A higher differential means more flare potential and less stabilty. A low differential ball will be more stable and have less flare potential.
16 LB. - 0.052
15 LB. - 0.052
14 LB. - 0.052
13 LB. - 0.043
12 LB. - 0.043
Intermediate Differential 
Difference between the RG of the core's x-axis and Z-axis on an asymmetrical core. Indicates the asymmetry of the core. A higher intermediate differential ball will be less stable and will transition more quickly from skid to roll than a ball with lower intermediate differential.

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Proof Honor Roll

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  • CHARLES PRICE279-300-244 = 823
  • Ted Baer300/762
  • Steven Wojdyla300/816
  • Brady DeLong1
  • Matt Steiger300
  • Justin Alves838
  • David Smith279/798

Proof Product Notes

The Proof is in the roll!

The Proof is a new upper mid performance release with possibly the strongest core numbers ever in this category and an updated Prime cover that will get Track Bowling fans excited. The Proof is very strong and continuous and surprised our testers because it is usable for a long time and does not seem to want to quit, despite the strong core, cover, and finish combination.

DynamiCore Technology

The Proof uses DynamiCore – the industry leading innovation in outer core technology developed by Brunswick Bowling Products. This leap in bowling ball technology is a more durable outer material that yields less compression upon impact increasing hitting power and creating an undeniable difference in sound and pin carry.

Click HERE to learn more about DynamiCore Technology.

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