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. Weights may vary slightly due to production. Put some bang in your shots Enlarged string holes across the hitting zone generate increased string-bed movement at the moment of ball impact. So you get explosive power. Advance your control ACS (Advanced Control System) technology reinforces the racket throat for maximum torsional strength. This stabilises the racket head during ball impact for superior control.