I recently bought a set of ZhengHao pads for a king Zephyr just to see how they were for the price and was very disappointed in their overall shape level ness and roundness having bought quite a few better quality pads there was no comparison and thought they would be a real pain to seat, wether they tend to get rid of the rubbish in the boxed sets and keep their better pads for individual purchases I don't know but they certainly weren't good