Tecnifibre 4S 12m Set

TECNIFIBRE 4S

Tecnifibre 4S (Black Code 4S) is a square-section co-polyester built purely for spin. Four sharp edges grab the ball on brushing contact, in a firm, durable construction that keeps the profile sharp. It is offered in a single colour.

It is Tecnifibre's most aggressive spin poly — firmer and more grabby than the pentagonal Black Code.

On-Court Performance

The square edges bite the ball hard, producing heavy topspin, sharp dip and aggressive kick. On full swings the ball drops sharply inside the baseline.

The feel is firm and direct — this is a tournament-style spin string that rewards committed technique rather than a comfortable all-rounder.

Control is strong for a spin-first string once you adapt to the extra dip, and off-centre bite stays consistent.

As with any four-sided poly the edges round off over time and spin potential fades before the string breaks — restring on a schedule.

Who Should Use It

• Heavy topspin baseliners who want maximum bite

• Advanced players with fast, upward swing paths

• Players who want to shape and angle the ball aggressively

• Players moving up from Black Code who want more grip

• Kick-serve specialists

Who Should Not Use It

• Flat hitters who want a low, dead trajectory

• Players who want free depth and power

• Players with arm sensitivity

• Players who dislike frequent restringing

Hybrid Setups & Performance Adjustments

Power
String at the low end of the range or pair with a multifilament in the mains.

Control
Use a full bed toward the upper tension window.

Spin
Put 4S in the mains at mid-range tension to maximise edge grip and snapback.

Comfort
Hybrid with a soft poly or multifilament in the crosses and avoid high tension.

Tension Stability
String mid-range and restring on a schedule.

Durability
Move to a thicker gauge, or hybrid with a poly cross, for frequent breakers.

Technical Specifications

Typology:
Monofilament

Shape:
Square (4-sided)

Composition:
Co-Polyester

Available Gauges:
1.20 / 1.25 / 1.30 mm