The Yonex Poly Tour Fire suits intermediate to advanced players with long and fast strokes due to the control that it offers. The feel is firm but nicely dampened, with a low level of shock on off-center hits. Yonex has made this string with its unique Silicone Oil Infused Filament (SIF) Technology. This is a manufacturing process that reduces stringbed friction, enabling the strings to snap back with vicious force, which gives players a lot of spin. String is probably too firm for beginners. Made in Japan.