Product review (5 stars): Why did I not know about these sooner?
I have been dealing with a front loading washing machine on a pedestal for two years now.  It's located on the main floor of my house and when the spin cycle comes, every glass in my kitchen starts to shake.  I was about to remove the pedestal, but found these little gems.  In all honesty, the vibration transmission to the floor had to have decreased by 2-300%.  It was a challenge to place the red packaged feet in my tight laundry room, but with some creativity, I got it done and can't believe how much better it is.  Yes, they are expensive for 4 pieces of rubber, but TOTALLY worth every cent.  GREAT PRODUCT!