The Shock ZoneProâ„¢ expands the envelope of Proactiveâ„¢ performance by combining a high RG core system with a DTX Proactive cover stock to produce the latest reacting, most skid-snap Proactive ball to date. The large doorknob shaped core incorporates a 2†diameter low-density sphere in the center of the ball to push the RG Max to 2.639, the highest ever achieved with a DTX Proactive cover stock. This higher RG, in combination with the medium-high 0.048 RG differential creates an overall RG average of 6.1, also the highest ever for a DTX Proactive. This core/cover combination helps to keep the ball in check through the front part of the lane, allowing it to unleash its power in the mid-lane and back-end. Thus the Shock ZonePro provides a Proactive ball with better down-lane recovery and increased entry angle into the pocket than other Proactive choices. The performance of the ball makes it the perfect choice to bridge the gap between Reactive balls and the more aggressive, earlier arcing Proactive balls in the Brunswick line. Compared to the other balls in the “Zone Proactive Seriesâ€, the Shock ZonePro’s overall hook potential is similar to that of the Riot ZonePro Purple Pearl, but the Shock ZonePro’s higher RG core system creates a breakpoint further down the lane, generating a more skid/snap arc than the other balls in the Proactive Series. Compared to balls in the “Zone Reactive Seriesâ€, the Shock ZonePro will produce a similar to slightly sharper arc shape compared to the Danger Zone Red Alert, but with more overall hook potential than the Red Alert. The specifications are: Part Number: 60-103409; Cover stock: Proactiveä DTX-3; Hook Potential: 115; Length: 100; Typical Breakpoint Shape: 75; RG Max: 2.639; RG Min: 2.591; RG Diff: 0.048; RG Avg: 6.1; Hardness: 76-78; Color: Burgundy Sparkle; Surface Finish: Cerium Oxide Trizactä; Weights: 12-16 lbs