Tecnifibre X-One Biphase 18G Tennis String

I've been using this string for about 20 yrs now, it is my go to string for racquetball. I love the consistency and feel of this string. Normally I use the 17g and recently purchased the 18g.

I'm a 4.5 player, though not a heavy top-spin hitter, and have exclusively used the 18 gauge Bi-phase for about two years, strung at 55 lbs. of tension. The strings are perfect for me. I play about 12 hours a week (in practice and tournament play) and predominantly, 95 percent of the time, hit the ball in the sweet spot of the strings. The strings break in the sweet spot after 26 to 32 hours of play. The strings hold up surprisingly well. The way I figure, once the strings break, it's time to replace by the strings losing tension, which raises another benefit of the Technifibre Bi-phase line. The strings are pre-stretched providing less tension reduction in the usage.

Pro: Like the strings very much. Nice feel! Comfortable! Con: They don’t make me play as well as Federer 🙃

Attempted to play 18 gauge. Well lasted 3 weeks. The performance was good. Good power, feel and comfort. Friendly on the arm. Maybe try 17 gauge.

I use X-One Biphase in the mains for hybrid stringing and use NRG2 in the crosses. The X-One Biphase is a very playable string that has more durability than NRG2. The combination is great if you really want to have feel and touch from your strings.