Review on Experience Ultimate Durability and Longevity with MiniXX Vibration Ball Shock Premium Durable Long Lasting (PT) by William Mathis

I was a little disappointed that they didn't work properly with the Vortex racquet. The Vortex has a larger string but requires long dampers. The photo shows how it was stretched. It was quite difficult to put on and actually pulls the threads inwards. I think it should work just fine if I just put it on the middle 4 strings, but the damper that came with the racquet wasn't tensioned properly.