YONEX Polytour Fire 200 M Tennis Reel String

Features:

– Impressive snapback and responsiveness from SIF technology (Silicone Infused Filament)
– For players with medium-to-fast swing speeds looking for added power and spin

Technology:

SIF:
– This new Silicone oil Infused Filament (SIF) technology–monofilament infused with Silicone oil–allows big hitters to experience ultimate spin from intense snapback speeds. Greater snapback produces a powerful spin. SIF Technology with unique pentagonal structure allows the string to move faster than conventional models, increasing spin.