King Cobra SZ 440 Unlimited. This is the non-conforming hot face version of Cobra's popular SZ series - so it will not be legal to use in competition after January 2008. The King Cobra SZ drivers (SZ sounds for Sweet Zone) feature a visible Dual Weighting System on the sole that moves the centre of gravity lower and back to promote a higher moment of inertia for greater stability; and lower spin variance across the nine hot points across the club face. The combination, according to Cobra, provides for maximum allowable energy transfer and a higher coefficient of restitution (COR) over a greater effective hitting area, resulting in longer distance, greater forgiveness and a solid feel and sound. Large 440 cc head makes for easy shot-making. This is a non coforming driver. In simple terms - unless you are a top amateur playing in national competitions, you can use this driver in ALL club competitions until Jan 2008. After then, you will not be able to use it in club competitions but can, of course, use it for recreational play. For detailed information visit the R&A website http://www.randa.org/