Typhoon Bryson had LA Golf make a new set of irons specifically for him, with a lot of tungsten weight in the toe. Bryson says mcs the grips are so heavy, the center of gravity is shifted toward the heel. So they added the tungsten weights to bring the center of gravity exactly to the center of the clubface.
The implication is that if you use this grips on a normal iron, you have moved the sweetspot closer to the hosel.
I use Golf Pride Tour grips in the jumbo size. They are not as far as the JumboMax, and i think they are not as heavy, either. They also don't take away the feel of the club. I love them. I think they are the best grips on the market. Not too soft, not too firm. Your hand doesn't slip and the grips feel like neither sandpaper nor fly paper (i.e. they are not tacky/sticky). These grips are not cheap, but they are worth every penny, IMO.
