The new high density sponge provides the rubber with betterrebound and good ball retention, providing the right amount ofdeformation at the moment of contact with the rubber. The specially improved rubber formula gives the surface of the rubbera sensitive rebound speed. The carefully blended particle sizeprovides good support for the rubber surface and guarantees afull hitting arc for the whole rubber. The improved InternalEnergy Technology on the one hand gives the rubber a highspeed attacking performance on the other hand, it gives therubber an excellent control feel and a transparent sound,
 
 
comes in 45 hardness or 47 hardness , red