4G is the stiffest poly I have ever played with.
Stiffer than Babolat Revenge, stiffer than Alu Rough etc.
Hard, hard, hard string on the arm and you feel accumulating wear on the arm over several weeks of hitting.
Borne out by subjective testing and the TW/RSI stiffness numbers, which are in the stratosphere. 1.40mm is going to be an arm breaker.
Alu is ALOT nicer even though it doesn't last very long. Much prefer Alu's crispness as well over 4G's dull feel.
Last edited by Torres; 01-13-2013 at 02:35 AM.