Even though the cover is old school Urethane, the core is very strong. I recently picked up a used black axe and put the mass bias in the strong position, and it will move.. I picked mine up to cpmpliment my previous two pickups......a Brunswick blue phantom nib and a brunswick crimson Phantom nib..I had been struggling with reactives being too much at the breakpoint and on the backend, so earlier this year went to an all Urethane league bag. This black axe fits perfectly as the middle of the bag ball with a strong blue phantom as the strong piece and a crimson phantom as the weak piece.
The axe will move and it does hit & carry very well(but still more controllable than a reactive ball)
Brad