HEAD Tour Pro Tennis Racquet-Strung (U20) This tennis racquet has Nano Titanium technology, which integrates Nano Material to strengthen the Titanium technology for a stronger more stable racquet providing you with more power. The head size of the racquet is super oversized, with a 23mm beam and a 18/19 string pattern. The racquet weighs 9.7 oz. strung and is standard in length 27". The balance of the racquet is 2/3" HL. The grip size is 4 1/4".