Callaway is the #1 iron brand in golf thanks in large part to our industry-leading 360 Face Cup Technology, and our irons set the performance standard in the new 2017 Golf Digest Hot List. Steelhead XR, Apex and Big Bertha OS all received gold medals, but the undeniable champion of the category were the Big Bertha
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Big Bertha OS Irons incorporate a revolutionary clubhead construction, called the Exo-Cage, that promotes more distance in an entirely new way. Callaway Big Bertha OS Irons: Specs