DUNLOP-BioFibre M 3.1 Tennis Racquet-() The Dunlop BioFibre M 3.1 Tennis Racquet The Dunlop Biofibre M 3.1 is slightly lighter than the Biomimetic M 2.1 at 11.5 ounces strung, but both racquets are built for aggressive, higher-level players. Biofibre in the racquet shaft increases shock absorption by 18% for top-level comfort. The 3.1 incorporates AeroSkin technology to enable quick acceleration, creating maximum amounts of pace. Though the 3.1 features a slightly more open string pattern (indicating that the frame can aid in spin production), it`s still built to give f... Aeroskin Cx Construction | Biofibre Technology | Mos2 Grommets Size - (4_3/8) | Color - (See Description) Authorized Dunlop Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.