Tecnifibre's X-ONE BIPHASE multifilament tennis string, offering high durability and the best energy return. - Brand: Tecnifibre - Model: X-ONE BIPHASE - Gauge: 17/1.24 - Color: Black - Features: Multifilament - Durability: High Durability - Playability: Best Energy Return - Arm Integrity: Shock-absorbing properties Thank you for viewing.