HEAD-MicroGel Radical MP Prestrung Tennis Racquets-() Racquet comes prestrung with Head Synthetic Gut 16g midtension (57lbs). MicroGel technology is the combination of a low density material, called Head MicroGel, with stiff and strong carbon composite fibers to create a racquet with incredible responsive qualities... Microgel Technology | Prestrung | Excellent For Control Size - (See Description) | Color - (See Description) Authorized Head Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.