Product review (1 stars): SAVE YOUR MONEY
Save your money.  This is a waste.  The vibration goes right thru the "Silent Feet" and shakes the floor.  The installation is even more maddening than the $50 wasted.  Have you ever tried to center up a tall rubber disk under the back feet of a washing machine that is between two other appliances?  It ain't easy!  Then feel the vibration in spite of the new feet.  I would demand my money back, but it is not worth it to take the darn things back out.  Anyway, I think they are stuck tight to my floor.