Tecnifibre Black Code 17 is a spin-oriented co-polyester tennis string designed for aggressive players who want control without the excessively harsh feel of traditional polyester. Its five-sided profile helps grip the ball for increased spin, while Thermocore technology provides a more flexible, comfortable response. The 1.24 mm diameter enhances ball feel and responsiveness, making it a strong option for players who rely on fast swings and heavy topspin.
Intermediate to advanced players who generate their own power and want a controlled stringbed with strong spin potential. Particularly suited for aggressive baseliners seeking a more comfortable alternative to firm polyester strings.
| Material | Co-polyester |
| Construction | Five-sided monofilament |
| Gauge | 17 / 1.24 mm |
| Length | 660 ft / 200 m |
| Technology | Thermocore |