About this item Big Bertha B-21 is the first Big Bertha Iron with our A.I.-designed Flash Face Cup. This industry-leading Flash Face Cup is in each club. We’ve created high ball speeds and increased spin robustness with a sophisticated face architecture that’s unique to every loft. This club profile is engineered to give you more confidence over the ball with noticeably wider soles. For easy launch, lower spin and straighter shots, we’ve added more offset. We’ve added a significant amount of custom tungsten weighting. So we can deepen the CG in each iron with extraordinary precision, while still maintaining ball speed in the Flash Face Cup. Our patented urethane microspheres comprehensively absorb unwanted vibration for exceptional feel, while also maintaining fast ball speeds.