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
..The AMB-IMMORTAL is the latest adaptation of our 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.
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).
To Layout the AMB-IMMORTAL properly, you must first mark the "Virtual Mass Bias" by drawing a line from the 1/4" locator pin on the backside, through the 1/2" white flip pin around the ball. Mark an "x"180 degrees from the AMB pin (13 1/2" from the AMB pin which puts the "x" 6 3/4" from the black pin. This Virtual Mass Bias point can then be treated using the same general rules that apply to other typical mass bias spots.
*** By using the AMB cap to create an Anti-Mass Bias (negative mass bias on the back side) it allows the ball to have a lower RG than the original DC core while maintaining a high differential. It also helps maintain more of the core dynamics for most drillings. In the case with most strong Mass bias balls, when drilling the thumb - you remove a large portion of the heavy core or cap used to create the bias, resulting in less of the core''s original dynamics. BUT, with the AMB core, you drill into lighter coverstock and save almost all of the original core shape - retaining the true reaction originally designed by the core.
