The AMB-IMMORTAL is the latest adaptation of Visionary Bowling Products highly successful Anti-Mass Bias core design. Unlike other balls which use dense materials to create a mass bias, the AMB design utilizes an extremely light cap opposite the desired mass bias location. This AMB flip cap creates a negative mass bias on the side with the cap and also creates a positive mass bias at the desired location. This allows the bowler to drill the ball in just about any possible manner, without affecting the core shape or dynamics.

Finish: 1500 Polish
Hardness: 75-77
RG: Low (2.51")
Flare: Ex. High (.078" differential) 6-9" flare
This ball was approved before the latest rule changes and is much higher than the new USBC limits of .060"
Avail. Wts: 13-16# (AMB - IMMORTAL core)
10-12# (on request - light wt. core)
Lane Conditions: Medium
Color: Black Pearl
Coverstock: Reactive Pearl

Although the AMB-IMMORTAL Pearl uses the same shape core as the Centaur-AMB line that's where the similarities end.

The AMB-IMMORTAL core has a heavy cap added to the bottom of the core. This allows the density of the top cap to be increased significantly. The result is a core that produces an extreme flare potential with it's 0.078" differential (This ball was grandfathered in before the USBC changes and is currently higher than any new ball can be produced - BUT it is legal for use in all USBC competition because of when it was approved).