Quantum Bowling Balls. This ball has been placed back in production exclusively for bowlingball.com by Brunswick Bowling.You will not be able to get this ball from anyone else in the world!THE QUANTUM NAVY PRO ACTIVEfrom BrunswickARGUABLY ONE OF THE BEST BALLS EVER MADE!! YOU WILL NOT FIND THIS BALL ANYWHERE ELSE!!! THIS IS THE ORIGINAL QUANTUM MUSHROOM CORE DESIGNRETAILED FOR 269.99 IF YOU MISSED THIS GREAT BALL THE FIRST TIME AROUND HERE IS YOUR 2ND CHANCE The Navy Quantum with ProActive DTEX 1 coverstock offers a higher hook potential than Reactive but with a more skidsnap arc than MTX ProActive. As with all ProActive ball the Navy Quantum is more resistant to tracking than Reactive urethane.With the arrival of the Navy Quantum with ProActive DTX 1 coverstock, we have completed the introduction of the first generation of ProActive coverstocks. ProActive technology increases the traction in oil, while decreasing the over reaction off of the driest boards on the lane. The result is a progressively more even reaction and increasing hook potentials as we move from Reactive coverstocks through the DTX MTX ETX ProActive series.