String comparison
Black Code 4S vs Poly Tour Rev
Tecnifibre Black Code 4S against Yonex Poly Tour Rev: ratings, specs and which one fits your junior.
The short answer
Both are polyester strings. Black Code 4S leads on spin and control. Poly Tour Rev leads on comfort and tension hold. They score the same for arm friendliness (2/5). Black Code 4S costs less per set.
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 Black Code 4S if…
- You want more spin (10 vs 9 out of 10)
- You want more control (10 vs 9 out of 10)
- You want to spend less (from $14 vs $16 a set)
- Best for: maximum spin seekers
- Best for: advanced players with full swings
- Best for: control-obsessed baseliners
Pick Poly Tour Rev if…
- You want more comfort (6 vs 5 out of 10)
- You want more tension hold (8 vs 7 out of 10)
- Best for: high-performance players confident in their strokes
- Best for: spin seekers wanting control
- Best for: players who generate their own power
Specs side by side
| Spec | Black Code 4S | Poly Tour Rev |
|---|---|---|
| Type | Polyester | Polyester |
| Construction | Square-shaped co-polyester with four spin edges | Octagonal co-polyester monofilament with SIF (Silicone-Infused Filament) technology |
| Gauges | 16, 17, 18 | 16, 16L, 17 |
| Stiffness | High | High |
| Set price | $14–18 | $16–20 |
| Reel price | $150–180 | $170–200 |
| Arm friendliness | 2/5 · Low | 2/5 · Low |
| Cost to maintain | 4/5 | 3/5 |
| Recommended from | Age 15 | Age 15 |
| Levels | Advanced, Elite | Advanced, Elite |
| Play styles | Baseliner, Big hitter | Baseliner, Big hitter |
| Junior tension | 44-48 lbs for juniors. String low due to stiffness. | 46-50 lbs for juniors. String low - stiffest in Yonex range. |
Black Code 4S in short
Black Code 4S is Tecnifibre's maximum spin and control polyester with a square shape and four grippy edges. Lab tested stiffness of 209 lb/in makes it quite stiff. "This string's most undeniable characteristic was control" - it enabled playtesters to execute their most powerful strokes without fear of overhitting. The ability to take massive upward cuts combined with the four grippy edges was "a recipe for massive spin." Low powered but provides excellent bite on the ball.
Poly Tour Rev in short
Yonex Poly Tour Rev features an octagonal shape for extra bite plus SIF (Silicone-Infused Filament) technology to increase string snapback and spin potential. The stiffest in the Yonex Polytour range - a bit stiffer, crisper and more control-oriented than Poly Tour Pro. "Definitely more control oriented, which is exactly what I need for attacking tennis." Firm but muted, which helps comfort. Above-average tension maintenance in lab testing. A big string for high-performance players - not for beginners. Good for players with arm pain wanting comfort without power loss.
Black Code 4S vs Poly Tour Rev: quick answers
Which has more spin, Black Code 4S or Poly Tour Rev?
Tecnifibre Black Code 4S, with a spin rating of 10/10 against 9/10.
Which is more arm-friendly for a junior?
They score the same, 2/5. Black Code 4S is recommended from age 15 and Poly Tour Rev from age 15.
Which lasts longer?
They tie on durability (8/10). Tension maintenance: Black Code 4S 7/10, Poly Tour Rev 8/10.
Which is cheaper?
Black Code 4S costs about $14–18 a set and Poly Tour Rev about $16–20, at typical retail.
The short answer and the "pick if" lists are generated from our ratings and junior data only. Data verified 2025-01 (Black Code 4S) and 2025-01 (Poly Tour Rev).