De nieuwe Topsnaar van Yonex. Dikte:0.69mm. Installed Nano Carbon Fiber in coating surface. 4 times more modulus of elasticity than carbon nanotube. Prevents scratch of string surface. Gives durability to even high repulsion (thin) string. Offers durability the same as 0.70 gauge with high repulsion of 0.69 gauge. Even provide high hitting sound.