Product description the ball of steel is one of our hottest products for a reason after 20 strokes the light bulb comes on and you start making strokes that are accelerating crisp and solid at 5 times the weight of a normal golf ball you quickly see and feel where your stroke is loose your body will auto correct and your putts will dropthe ball of steel gives instant feedback on several common putting flaws mis hits the weight of the ball of steel means it rolls off the putter face slow