Tecnifibre NRG2 18 / 1.18 String Set

The X-One BiPhase string is of the highest quality and provides plenty of control, good feel, and a lively response. Ideal for players who want a string that is gentle on their arms without sacrificing power. It also maintains string tension well. It comes the closest to natural casing. It is more lively than 16 gauge but less durable. Ideal for easing the strain of a tight string pattern.

"X-One Biphase uses fibers called High Heat Capacity (HC2) that allow the use of the novel chemical process called trimerization," according to Tecnifibre. This new process uses extreme temperature changes to increase the cohesion between the bonds of chemical molecules, resulting in improved dynamic efficiency (power) and exceptional feel.The new patented Biphase process, which includes visible markings on the string, extends string life by 20% and produces more spin. The multifilament fibers, like the top-of-the-line string, NRG2, are dipped in polyurethane for better shock absorption and comfort."