"Duramix string
- Combo range's string
- best combination of durability and comfort
- Duramix combines the durability of Polyester range strings, and the comfort, dynamics and playability of Premium range strings.

Features:
- Combro range: highly recommended for rackets lighter than 300 g.
- Multifilament structure: 960 filament + polyester monofilament inside
- SPL additive: extends string's lifetime with up to 40%
- PU 400 inside: patented manufacturing technology

With the development of Promix and Duramix, Technifibre made a uniqe innovation, combining multifilament and polyester technology, and created strings optimized for competition tennis, yet comfortable.
Duramix is thicker than Promix, so it's more durable.
Gauge: 1,35 / 1,40 mm"