The latest irons from Tour Power, the Great Balance Plus (Newest Callaway Big Bertha clone), feature a hollow core which is made from a two-piece construction and moves weight low and farther away from the hitting face to increase forgiveness. The insert face technology makes the hitting face more flexible, helping the ball jump off the club with high the ball speed wherever you hit it on the face. The more forgiving iron sole designs are wider in the longer irons to give you confidence, narrower in the shorter irons. The Great Balance Plus irons will give golfers improved performance with enhanced workability and forgiveness for ultimate confidence. The new Great Balance Irons can make you up to 2 clubs longer - true story. It's the BALL SPEED all across the face that makes this distance a reality because for the first time ever, new Face Cup Technology that is used on fairways woods are now used on this iron set!