As well, Iso-Puck's can also be used as an accessory for DJ Gear - Place them under turntables and mixers to isolate them from the supporting surface and reduce the issues associated with vibration and heat.
The Iso Acoustics Iso Puck is the nicest vibration dampener I have used. I have several sizes to suit the weight to be carried and they work amazingly. I love these units, and they look sweet.