Zone Classic

From Brunswick:

Zone Classic features an inner core shape which is new, but familiar. Start with the classic Danger Zone shape, then stretch it laterally to create asymmetry. Keep stretching until you create a highly significant built in Preferential Spin Axis (PSA). Add the PSA locator pin and you have the new Zone Classic core, an Ultra Low RG design combining the proven image of Zone with Brunswick’s patented PSA core technology. Next add Activator Coverstock, the same coverstock used on the original Inferno, clean through the fronts, great mid-lane recovery, hard arcing backend, unprecedented durability. Factory finished with High Gloss Polish, the purple pearlized coverstock complements the Ultra Low RG Core to deliver an aggressive but forgiving ball reaction that matches up on medium-dry to medium-oily lane conditions.