Spira

Our NEW 7.00mm SPIRAL WINDING patented technology increases torsion stability by 12%, compression strength by 9%, impact-resistance by 15%. In addition, shock absorption and elasticity is also improved. With prefect Aerodynamic design, the frame have a super low friction of air resistance. The NEW Square Head Shape make it possible for 76 string holes, which icreased 10% of the sweet spot of the racket striking zone.