The Black Diamond string has a very high energy return, extreme spin and power. It gives you a greatly improved tension stability, the very best in our string range. The latter is made possible by using a newly developed material – HyperNylon - which offer improved polymer tension stability. DoubleAR HyperNylon is produced through a co-extrusion process combining two different nylon materials and in addition as a last process - create a rough surface texture that adds that extra spin on the ball.
For best result, pre–stretch the string by 6% when stringing the racket. The string is made in Italy by DoubleAR.