CALLAWAY BIG BERTHA B21 IRONS  The Big Bertha name has become synonymous with ease of use and extremely high levels of performance and, with the release of the Callaway Big Bertha B21, Callaway looks to continue this tradition. The B21 is a club that falls into the super game improvement category and is aimed at golfers with slower swing speeds who may need a little help in launching the ball. It is the largest and most forgiving iron in the Callaway range.  The Big Bertha B21 set of irons is the first ever Big Bertha to ever be designed using artificial intelligence and promises the user incredible ball speeds and long, straight shots. The A.I. designed Flash Face Cup has already been used in Callaway’s superb Mavrik range of irons and...