The Brunswick International Series is designed to match up to typically more demanding international lane conditions.The Red Alert 300 features an inner core shape which is new, but familiar. Start with the 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 PSAlocator pin and you have the Red Alert 300 core, an Ultr 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 arching backend and unprecedented durability. Factory finished with High Gloss Polish, the black solidsilver pearl 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.Product Type Bowling Balls