The first rubber to be introduced with Yasaka Hybrid Energy system was the Rakza 7, which is highly valued by high class players all over the world. The latest addition to the Rakza family is Rakza 9, which has improved speed characteristics. The surface rubber of Rakza 9 has a newly developed formula/rubber combination. In addition the new sponge is made of a more homogenous material and has larger pores. Rakza 9 is the fastest of Yasaka Hybrid Energy rubbers and is suitable for technical offensive players, using both high speed and spin to win the point.