Dunlop Sports Biomimetic Ultimate Squash Racquet Construction: Biomimetic Headsize: 500 sq cm Weight: 132g unstrung Balance: Head Light String Pattern: 16x19 String Tension: 20-30lbs/9-14kgs Aeroskin: Reduces aerodynamic drag by up to 25% for increased racquet speed and power. Aeroskin is inspired by the skin of the most highly evolved marine predator, the shark. HM6 Carbon: Reduces racquet frequency and vibration by up to 10% for ultimate energy return and feel. HM6 is inspired by one of the strongest, most efficient structures in nature, the honeycomb. Gecko-Tac: Provides up to 50% more grip and tack than previous Dunlop technology, giving greater control, feel and precision. Gecko-Tac is inspired by the pads on the foot of one of the most highly evolved species, the gecko.