HEAD MicroGel 10 Performance Tennis Racquet (Pre-Strung) - New! MicroGel silicone-based material is combined with stiff and strong carbon composite fibers to create a racquet with incredibly responsive qualities Rock-Solid Feel and Touch: On ball impact, MicroGel uniformly distributes the impact load around the frame to provide a rock-solid feel and superior touch During ball impact, MicroGel deforms and compresses, absorbing and dispersing the impact to the entire frame, then returns quickly to its original shape Beam: 25.5/25.5/27 mm Head Size: 106 sq in