Callaway added a large piece of tungsten to the Big Bertha B-21 to lower the center of gravity. (David Dusek/Golfweek)
Callaway added a large piece of tungsten to the Big Bertha B-21 to lower the center of gravity. (David Dusek/Golfweek)
Sports blog information from USA TODAY.
Callaway added a large piece of tungsten to the Big Bertha B-21 to lower the center of gravity. (David Dusek/Golfweek)
Callaway added a large piece of tungsten to the Big Bertha B-21 to lower the center of gravity. (David Dusek/Golfweek)