The Ping G400 irons are made of Hyper 17-4 stainless steel for increased strength and a thinner face, The G400 irons feature COR-Eye Technology which generates faster ball speeds for dramatic gains in distance and shot height for better stopping power on the greens. This technology is combined with a unique top rail design to increase face flexing and ball speed for launching the ball higher. The co-molded 3-piece cavity badge provides an enriched impact response that creates a powerful sound and feel. A concealed CTP weight allows you to customize swing weight and the hydropearl chrome finish reduces friction to improve launch and spin in wet conditions and from the rough.