Product review (5 stars): Great product!
These feet worked perfect. The feet are a made of two types of material molded together. A hard plastic top that makes contact with the machine feet and a soft flexible base that contacts the surface of the floor. I've looked for years for something to control the machine walking and this is the first product that ever worked.  The front-load washer is the biggest problem and also the heaviest to move back into position all the time. I installed the feet 2 weeks ago and there is not even a little movement. I did find that the machine feet move a fraction of an inch inside the top of the feet but  they rest against the raised ridge on the top and that's where they stay. The flexible material touching the tile floor does not move at all. The bottom of the pads are extremely smooth and generate a high coefficient of friction. They feel almost like they are glued to the floor but they are not. Just lift the feet, slide them under and that's it. The only caution, make sure you have the machines exactly where you want them when you install the feet because there is no sliding the machine around after installation.