The club heads on the Big Bertha OS Irons feature Callaway's Exo-Cage technology. This design allows the club to be constructed of strong but very lightweight material, allowing for the strategic placing of weights in the head. The reason for this is to allow for a larger sweet spot, meaning that these irons are more forgiving than previous Big Bertha Irons.
Next Gen 360 Face Cup
The Big Bertha contains the Next Gen 360 Face Cup to help increase ball speed. Basically, each iron's face is partially hollow. The decrease in weight allows for faster swing speeds, while the hollow pocket allows for more flexibility. This increased flexibility leads to an increase in distance. In addition, the Next Gen 360 Face Cup also allows for a more forgiving clubface, which means shots that are struck low or left or right of the center will be more accurate and fly straighter.
The Big Bertha OS also includes Tungsten-Loaded Standing Wave technology. This involves the use of tungsten, an exceptionally dense metal, on the sole of the club which lowers the center of gravity for the club. This allows for a higher launch angle and more distance on shots.
Steel and graphite shafts are available with Big Bertha OS Irons. The True Temper Speed Step 80 is the standard steel option with less flexibility and increased weight for smooth tempo players. The standard graphite shaft is the UST Mamiya Recoil ES 460, a lightweight and more flexible shaft ideal for golfers with slower swing speeds.