I bought the DHS balls from a local store in packs of 6. The packaging had Ma Long's face on it. But when I used the balls on the table they bounced the same hieght has the 3 star Xiom Ball but when I started playing with it the DHS ball seemed to go off the table and when I hit the ball with the normal force it seems to go off the table. Is this a problem with the DHS or the Xiom. I also tried the Butterfly ball and it seemed that I could put more force on the Butterfly and the Xiom Ball. I also experienced the same problem as the DHS with the Nittaku SHA.