Shimano Twin Power SW-C 4000 XG Spinning Reel Offshore, it often comes down to power vs. power. That’s where the Shimano® TwinPower® SW Spinning Reel truly shines. For knockdown battles involving mahi, sailfish, tuna, stripers, wahoo, and big reef fish, the TwinPower SW delivers the strength, rigidity, cranking power, and drag force needed to dominate and win.