Ting.. we will buy 2 sets of each casing shud be enough lor.. no need buy more than that.. maybe 3 at most. spend it once and for all, then dun have to worry for the next several years.
Ting, above I put Simmons liao kekeke.. my type of work, I demand good sleep and back care lor.. and it is really soothing when I tested it just last Sun. I so happy, I tell my frd to order for us, so the quick delivery this Fri evening!