What Happend to a golf club that has been cryogenically treated?

Cryogenic processing - Golf clubs and balls

Golf club heads that have been cryogenically treated (metal woods and irons) exhibit a sweet spot that is increased by 2 to 3 times its normal size. With the residual stress removed from the casting or machining process, it makes a difference-not just for longer shots but for more accuracy. Golf balls that have been cryogenically processed and hit on a mechanical swing machine showed an increased hit distance of 5 to 10 yards farther, and had a tighter landing circle. Combined with a cryogenically treated driver, the results showed balls could consistently be hit 20 to 30 yards farther.