Volkl tennis racquets are used on the professional tours by players such as Radek Stepanek. Volkl is a German sporting goods company known for their skiing and tennis equipment. Since the release of their first tennis racquet in 1972, they have remained focused on engineering revolutionary new technologies. Volkl's trademark technology is DNX. Volkl DNX is a revolutionary material developed in the Fraunhofer Institute in Germany. DNX is made of carbon nanotubes that are both lighter and 25 times stronger than standard carbon fibers. Volkl racquets with DNX are able to resist twisting better, increase stability on off center shots. Volkl tennis racquets with DNX provide maximum stability and power without sacrificing control. To learn more about Volkl tennis racquets and their numerous technologies, visit our Volkl tennis racquet technology page in our Tennis Express Buyer's Guide!