The Head Auxetic Extreme Tennis Racquet generates extreme spin and creates chaos for opponents. Endorsed by Matteo Berrettini, these racquets has been upgraded with innovative Auxetic technology for outstanding, crisp impact feel and is ideal for tournament players looking to dictate with optimal spin and power. Along with a shaft that helps create extra spin, the Extreme series has unique spin grommets which allow more string movement and a powerful trampoline effect on impact with the ball.