Our classical IV-L and IV-S are now also available with a newly developed comfort grip system, the so-called SGS (Sponge-grip-system). With IV-L SGS we did not make any changes to the classical composition of the blade?s unique and especially selected Ayous layers. Our researches and tests commonly developed with world class players resulted in a newly developed racket shape adapted to the grip shape, making the interval ?control ? acceleration? even bigger. The new grip system gives the necessary impulse to your hand.