I find this performance product. The "rubber" is compact without being hard and the double sided tape sticks properly on varnished wood. I use it at the feet of my speakers and also as speakers. 40 kg One foot is 70 cm high with a base of 30 cm X 30 cm and the speaker type library is 18 kg. 4 pads under the base of the foot and 4 blocks in the enclosure. The assembly is placed on a floor. A small pile of sand on the enclosure and good pieces of bass to assess vibration. Very satisfactory result (low dispersion sand and fairly slow) and transmission to ground is very low even at high volume. Impressed by the efficiency / price ratio.