Tenergy is the flagship rubber from Butterfly and is used by many of the World's best players. Powered by Spring Sponge Technology and with more distance between the pimples, Tenergy 64 is the fastest of the Tenergy rubber and offers more flexibility and a softer touch, enabling powerful and precise attacking strokes from mid distance. Spring Sponge Technology is produced by the unique format of air bubbles within the sponge and the thin pimples of the highly flexible surface, enable dynamic topspin play with heavy rotation. With the most speed among the Tenergy rubber, Tenergy 64 is the ultimate attacking rubber. Within the Tenergy Family of rubber, all styles of play can benefit from this new technology.