Rakza PO RAKZA PO is one of several rubbers with the newly developed top sheet using mainly natural rubber gum. This improves the level of grip and the power of spin drastically. The top sheet is combined with the new “Power Sponge”. The top sheet and “Power Sponge” work in perfect synergy, producing the Hybrid Energy rubber. With RAKZA PO Yasaka developed a short pimples out rubber with increased spin capacity, due to the shape of the pimples geo-metry and the use of more natural gum in the top sheet.