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Forged is just a process of making the clubs. A piece of steel is heated up to where it is extremely maleable. Then it is put in a machine where that stamps the hot steel into a mold, creating whatever shape the mold consists of, in this case a golf club. MBs are usually made this way and a few CBs are too, but you cannot make Callaway type CBs with the 360* cut inside. This is where casting comes in. Some of the extreme cavity back clubs like the TM rac, Callaway, and Ping clubs are cast because of the complexity and technologies put into the clubs. Casting is pouring hot liquid metal into a cast to create the club. Once the metal is cooled, they remove the mold and you have a club. Forged clubs are softer and cast clubs are harder. I can only tell you that it has to do with the crystalline structure of the metal of the metal as it cools.
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