Product review (5 stars): These work great!
These "feet" are a little tricky to get in place because they do not slide on the floor at all, but they work great.  We recently went from carpet to tile in the laundry room and were a little concerned that the washer would walk thus the reason for our purchase.  They totally keep our front loader from walking and the noise level is reduced by at least 80%.  We ordered two sets so our washer and dryer would be at the same height.  GREAT PURCHASE!