UltraNick 17 is 1.25mm in diameter for superior durability and string life. Textured surface increases ability to spin and cut the ball. Comes in 9m packet set
UltraNick 18 is 1.15mm in diameter for optimum soft feel and control of the ball. Textured surface amd thim gauge maximizes ability to spin and cut the ball. Comes in 9m packet set
