The Zetro Quad is a blade for topspin. The aim of Zetro Quad is purely the improvement in the ability of topspin. "Quad" is Xiom's innovative technology of using four layers of artificial materials sophisticatedly. Zylon fiber is directly placed under the top layers to increase the ability to grab the ball. Soft carbon fiber under the middle layers adjusts the overall performance, and at the same time reduces the unnatural feel, which is the shortcoming of Zylon fiber. The top layer of selected Kiso Hinoki wood guarantees comfortable feel. The result is the great ability of topspin. Making heavy topspin is effortless, and even secure. Players will always be able to take the initiative in the game with effective preparatory topspin attack, and keep it with continuous topspin from any distance.