Featuring SIF technology (Silicone Infused Filament) developed in partnership with NANODAX, Yonex POLY TOUR Fire 125 is the ideal choice for players with medium-to-fast swing speeds seeking increased power and spin. With impressive snapback and responsiveness, this polyester monofilament string comes in both 1.20 mm (17 gauge) and 1.25 mm (16L) sizes, and is available in red and black. Made in Japan. Item code: SET (12m): PTGF120, PTGF125.