6moons reviewed on Franc Audio Ceramic Disc Classic Footers.
"...the clever way of constructing this multi-tiered multi-stage vibration control device is highly effective. Besides isolating the device from its support surface, the footer also neutralizes casing vibrations without altering the sound’s core tonality. Lower noise not changed timbres could be the product's slogan..."
Linked : http://www.6moons.com/audioreviews/franc/1.html