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PolyTour Fire is a string that is designed for big hitters looking for lots of control, spin potential and durability. Not surprising, being a firm monofilament polyester, that PolyTour Fire offers plenty of control. However, it still provides a surprising amount of feel and does not transmit too much shock and vibration, even on balls struck outside of the sweetspot. Yonex uses its Silicone Oil Infused Filament (SIF) process to manufacture this string. SIF reduces friction and intern increases snap back and spin potential. PolyTour Fire also offers above average tension maintenance compared to other strings in this category.