Product review (5 stars): Great Product
We own a 10 year old washer that gets terribly out of balance, and used to walk all over the place.  These feet, (the ones with all four anti-slip pad, stopped the movement completely, and the material that is in contact with the floor is a very smooth, rubbery material that does not seem to damage the floor.  Getting the feet on is hard, because once the machine is on these feet, you cannot slide it.  I place a 2 x 4 under the middle of the washer, rocked the washer up on the back side, positioned the feet, and then did the same with the front. (after removing the 2 x 4).