Put simply it's the weight of the grip. The Classic Original is 200 grams and manufactured from rubber whereas our Big Daddy Light is just 60 grams which is pretty much the weight of a conventional putter grip. Though personal preference is the major contributing factor when selecting a new putter grip many golfers who wish to maintain ultimate feel through the putter head with an oversized putter grip will opt for the Big Daddy Light. The Classic Original or Classic Light are often used in combination with heavier mallet style putters.