Proof Pearl

Upper-Mid Performance

Coverstock: Outer shell of the ball; Prime Response Pearl
Finish: Surface texture on the ball (sanded, polished, etc); 500, 1000 Siaair / Crown Factory Compound
Lane Condition: Length and/or amount of oil on the lane; Medium to heavy oil
Color: Color of the ball; Black / Smoke Pearl
Weights: Available weights; 16-12 LBS

Core: Weight block inside the ball; Proof
Core Type: Basic shape type of the core (Symmetric, Asymmetrical, Pancake); Asymmetrical
RG: 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
Differential: 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.; 0.020

Follow up to a great ball!: It’s been a long-time since we’ve tested a ball like the Proof. A ball that looked great for everyone regardless of style and bowlers all over the world have confirmed this. While the Proof is known as a great ball, we are excited to follow it up with the Proof Pearl, a shiny version that gives you the same great reaction, that’s intended for more medium oil lane conditions.
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