The new technology combined with the ultra soft rubber surface provides an outstanding spin and a great playing sensation, allowing a secured and aggressive game. The integrated SPI (Speedglue-Effect-Inside) technology confers an extreme catapult reaction to the ball. Although you will use very little strength, your balls will be loaded with a lot of spin and speed. The exclusive rubber surface confers stability and a long-life expectancy. Notice the energy of this rubber after only few exchanges.