Ping's well known Rapture Hybrid features:
The combination of 17-4 stainless steel body, tungsten nickel sole plate and 475 super steel face in the Rapture Hybrids raise hybrid performance to new levels of distance, forgiveness and control.
The thin super steel face provides a hot, responsive hitting area and allows PING engineers to re-distribute weight in the form of tungsten nickel on the sole. The heavier sole plate positions the center of gravity low and away from the face for higher launch and low spin”resulting in high, penetrating trajectories for longer, softer landing approach shots.
