The King Cobra 440 SZ driver model includes the following features: - Milled Rhombus Oval Insert technology combined with a larger face for greater face flex. - A visible Dual Weighting System on the sole that moves the center of gravity lower and back to promote a higher moment of inertia for greater stability. - Lower spin variance across the all-important 9 points hot points across the clubface via modified (flatter) bulge and roll on the face for greater carry distance and accuracy. - The combination provides for maximum allowable energy transfer and a higher coefficient of restitution (C.O.R.) over a greater effective hitting area, resulting in longer distance, greater forgiveness and a sweet, solid feel and sound