The topsheet of the Rasanter rubber has a high degree of glossiness to compensate for the loss of rotation after the introduction of plastic ball. R is for rotation. These rubbers have better spin potential and allow you to consistently play a large variety of shots. Rasanter R48 is equipped with the sponge that has the same pore size as the previous Rasanter versions but with increased inner tension. This makes each cell a small compressor and gives the rubber greater power potential. Team up with the 48 ? sponge and its above-average optimal sweet spot.