Head YouTek Speed Pro Tennis Racquet  (Unstrung) The Speed Pro is Novak Djokovic's weapon of choice Its head size is 98 sq. inch Its length is Standard, 27 Inch It can balance 1 1 / 3 Inch HL (310 mm) It offers a heavier frame with a very thin beam, providing excellent touch for exceptional feel It comes with a leather grip for ultimate tour performance