Looks like a move in yonex direction. 1. Increase in no of holes to 76 (someone in forum said) 2. Decrease in shaft diameter to 6.6 (100zz has 6.1 ? I don't remember exactly) 3. Some dents in the cone. 4. 3U, 4U, 5U versions of racket although with different BP of 300, 305, 310 mm respectively (also classic yonex move).