DUNLOP 23 SQR BLACKSTORM CARBONDUNLOP 23 SQR BLACKSTORM CARBON Pack a more powerful shot Power Grommets give you an extra punch across the hitting zone of the racket, making this a great power frame for intermediate players Specifications: SERIES: Blackstorm LENGTH (CM IN): 68. 6 27 BALANCE: Head Heavy HEAD SIZE (CM IN): 510 79 STRING PATTERN: 16x19 CONSTRUCTION: Carbon Fibre FRAME WEIGHT (G OZ): 140 4. 9