Callaway GBB Epic Pro 8PC Iron Set - Steel

Innovation without boundaries

To develop Epic Pro irons, Callaway pushed themselves in a way that they could elevate performance to the highest level they’ve ever achieved in a compact players’ shape. It had to provide the absolute best combination of ball speed, distance, forgiveness, accuracy, control and feel. And to go beyond that standard, they had to be extremely meticulous, creative and committed to carefully crafting each material.

Callaway has been the #1 Iron in golf since the beginning of 2015. While developing Epic, they started by improving the technologies that made them the category leader. And Callaway's revolutionary 360 Face Cup is the technology that truly led them to #1.

The Face Cup incorporates an ultra-thin rim around the perimeter of the inner side of the face. At impact, the rim flexes and rebounds to add ball speed on center-face hits and minimize ball-speed loss on off-center hits. It’s especially effective on the most common mis-hits -- toward the toe and low on the face. To further improve face performance, they increased the rim’s flexibility by reducing the thickness to 1 mm at its thinnest point, resulting in even faster ball speed on center and off-center hits for more distance.

Every iron in this set is uniquely constructed to promote optimum performance. During development Callway studied and tested new ways to enhance launch and trajectory, and succeeded by introducing an incredibly high amount of MIM’ed tungsten (over 664 grams in the set) into their Internal Standing Wave technology. MIM’ed stands for Metal-Injected Molding, an injecting-molding process using finely powdered metal to create intricately shaped parts with tremendous precision.

Tungsten is relatively heavy, which allowed Callaway to control the head’s internal weighting so that they could give each individual iron its own optimized CG location. To do this, they engineered a precise amount of tungsten for each club. They could lower the CG in the long irons for easy launch and high, long carry, and raise the CG in the short irons for lower, more controllable flight. And they could better control the left-right CG positioning in tandem with the hollow hosel that creates weight savings. This is an expensive alloy to manufacture, but it’s integral to enhancing performance in the Epic Pro Irons.

Yet what truly sets this iron apart is the Exo-Cage head construction that we first applied to an iron in the Big Bertha OS, the only iron to earn five stars in every category of the 2017 Golf Digest Hot List. The high-grade steel structure in the center of the cavity stiffens the body, especially the topline and sole, so that the face can take on more impact load.

This is known as “energy lensing”, and in the irons energy lensing allows the face to behave more efficiently to promote faster ball speed and distance, dramatically enhancing performance. In fact, it helped raise the COR right up to the limit in each iron. It’s the highest level of ball speed and forgiveness enhancing technologies that Callaway has ever achieved in a pro head shape.

The multi-material head consists of a variety of premium components, each precision-milled and robotically laser-welded to give Callaway engineers precise control over CG location, COR, MOI and vibration control, with maximum structural integrity. A multitude of processes, steps and inspections are required to create each head.

And the slightly smaller head, slimmer topline, and less offset all promote the kind of keen feel and workability that better players want. The result is the most premium, high-performance iron ever to bear the Callaway name.

Features:

Next-Generation 360 Face Cup Technology for Longer Average Distance
Advancing the industry-leading face technology that made Callaway the #1 Iron in golf, the rim of the Face Cup is 1 mm at its thinnest point to add even more ball speed on center hits and further minimizing distance loss on off-center hits.

Exo-Cage for Energy Lensing and Maximum COR
Exo-Cage head construction stiffens the body to allow the face to take on more of the load of impact. This is known as “Energy Lensing” - it promotes faster ball speed for longer distance, and it helped raise the COR in Epic Irons right up to the limit in each iron. This is the highest level of speed and forgiveness we’ve ever had in a pro head shape. 

Multi-Material Standing Wave To Optimize CG Location
Multi-material construction demands strict tolerances, seamless fit and secure bonding. Epic Pro Irons are precision-milled and robotically welded, and every iron in this set is uniquely constructed for maximum integrity and optimum performance. Incorporating tungsten in the Internal Standing Wave allowed Callaway engineers to precisely position the CG in each individual iron. This includes a lower CG for easier launch and long carry in the long irons, higher CG in the short irons for a lower, more controllable flight, and left-to-right CG control in tandem with the hollow hosel.

High Performance Players’ Shape 
A slightly smaller head, slimmer topline, thinner sole and less offset, all to promote the kind of keen feel and workability better players want.