Cobra SZ 355 Ladies Offset. The King Cobra SZ drivers (SZ sounds for Sweet Zone) features 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. A large 355cc titanium head combined with an offset head make for easy shot-making.