Head graphenext instinct rev pro tennis racket the head graphenext instinct rev pro provides a massive amount of power for a light weight frame along with great manoeuvrability thanks to the new and improved graphenext technology this tennis racket also provides adaptive strip pattern asp technology that features two exchangeable grommet sets you can choose between 1616 for more spin and power or 1619 for more control head graphenext instinct rev pro tennis racket weig