String comparison
X-One Biphase vs NXT Control
Tecnifibre X-One Biphase against Wilson NXT Control: ratings, specs and which one fits your junior.
The short answer
Both are multifilament strings. X-One Biphase leads on power and comfort. NXT Control leads on spin, control and durability. For a junior with arm concerns, X-One Biphase is the safer choice.
Ratings
Power
Spin
Control
Comfort
Durability
Tension hold
Ratings are on a 1–10 scale. The higher score is in bold when they differ.
Pick X-One Biphase if…
- You want more power (9 vs 6 out of 10)
- You want more comfort (10 vs 7 out of 10)
- Arm comfort comes first (arm friendliness 5/5 vs 4/5)
- Your player is younger (recommended from age 8 vs 12)
- Best for: players wanting natural gut feel without gut price
- Best for: those with arm issues or tennis elbow
- Best for: flat hitters with slow to medium swing speeds
Pick NXT Control if…
- You want more spin (6 vs 5 out of 10)
- You want more control (8 vs 6 out of 10)
- You want more durability (6 vs 5 out of 10)
- Best for: players wanting multifilament comfort with poly control
- Best for: intermediate juniors with developing swings
- Best for: those transitioning from multi to poly
Specs side by side
| Spec | X-One Biphase | NXT Control |
|---|---|---|
| Type | Multifilament | Multifilament |
| Construction | High Heat Capacity (H2C) fibers with Biphasic trimerization process and polyurethane immersion | Alternating bundles of firm polyester and soft nylon fibers |
| Gauges | 16, 17, 18 | 16 |
| Stiffness | Low | Medium |
| Set price | $18–22 | $18–20 |
| Reel price | $200–250 | $180–220 |
| Arm friendliness | 5/5 · Excellent | 4/5 · Good |
| Cost to maintain | 3/5 | 3/5 |
| Recommended from | Age 8 | Age 12 |
| Levels | Beginner, Intermediate, Advanced | Intermediate, Advanced |
| Play styles | All court, Serve and volley, Touch player | All court, Baseliner |
| Junior tension | 52-56 lbs for juniors. Holds tension well for a multifilament. | 50-54 lbs for juniors. |
X-One Biphase in short
X-One Biphase is Tecnifibre's premium multifilament that combines their best technologies into a single string. The patented Biphasic process with visible marks extends string life by 20% while the H2C fibers allow extreme temperature treatment during manufacturing. Multifilament fibers are immersed in polyurethane for shock absorption and optimum comfort. Many users say "I've never tried natural gut, but X-One Biphase is what I imagine it would feel like." Easily one of the more powerful multifilaments available with cloud-like comfort even at higher tensions.
NXT Control in short
NXT Control brings the crisp precision of polyester to the comfortable NXT line. Constructed with alternating bundles of firm polyester filaments and soft nylon fibers, it gives playtesters excellent control on their biggest swings while maintaining multifilament comfort. A great middle ground for players who want more control than standard NXT but can't handle pure polyester.
X-One Biphase vs NXT Control: quick answers
Which has more spin, X-One Biphase or NXT Control?
Wilson NXT Control, with a spin rating of 6/10 against 5/10.
Which is more arm-friendly for a junior?
Tecnifibre X-One Biphase scores 5/5 for arm friendliness, against 4/5 for NXT Control. It is recommended from age 8.
Which lasts longer?
Wilson NXT Control rates 6/10 for durability against 5/10.
Which is cheaper?
X-One Biphase costs about $18–22 a set and NXT Control about $18–20, at typical retail.
The short answer and the "pick if" lists are generated from our ratings and junior data only. Data verified 2025-01 (X-One Biphase) and 2025-01 (NXT Control).